A254259 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A254259

Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally

4351908, 52034327, 240716320, 197326142, 742483152, 1249946456, 3756830312, 14833693096, 43837197480, 151675299240, 570693507496, 2008409942440, 7196492523944, 27787520567720, 104832812624296, 392237057943976

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 7 of A254260

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 7*a(n-1) -6*a(n-2) -208*a(n-4) +240*a(n-5) +1248*a(n-6) -2816*a(n-7) +5120*a(n-8) +512*a(n-9) +57344*a(n-10) -290816*a(n-11) -229376*a(n-12) +851968*a(n-13) +2228224*a(n-14) -524288*a(n-15) -10485760*a(n-16) +8388608*a(n-17) for n>25

EXAMPLE

Some solutions for n=1

..0..0..0..0..1..0..0..0..1....0..0..1..1..0..0..0..0..1

..0..0..0..0..0..1..0..0..0....0..0..0..0..1..1..0..1..1

..1..1..0..1..1..1..1..1..1....0..1..0..0..1..1..0..1..0

CROSSREFS

Sequence in context: A210403 A263155 A254266 * A254305 A237537 A276323

Adjacent sequences: A254256 A254257 A254258 * A254260 A254261 A254262

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved