A250988 - OEIS

A250988

Number of (n+1)X(2+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction

169, 872, 4111, 18387, 80133, 344135, 1466191, 6219851, 26329263, 111352239, 470824467, 1991012259, 8422006891, 35637583483, 150851830807, 638746833775, 2705353300919, 11460847050775, 48561125420483, 205789941962155

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

OFFSET

1,1

COMMENTS

Column 2 of A250994

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -73*a(n-2) +156*a(n-3) -13*a(n-4) -480*a(n-5) +581*a(n-6) +212*a(n-7) -654*a(n-8) +78*a(n-9) +264*a(n-10) -44*a(n-11) -40*a(n-12)

EXAMPLE

Some solutions for n=4

..0..2..0....0..0..2....1..0..1....1..0..2....2..0..2....0..0..2....0..1..1

..0..0..2....1..2..0....1..0..2....1..0..2....2..0..1....0..0..2....0..1..2

..1..1..0....1..2..0....0..2..0....0..2..0....2..0..2....0..0..1....1..2..1

..1..1..1....1..1..1....2..0..2....1..1..1....1..1..1....0..1..0....1..1..2

..2..2..2....2..2..2....2..1..1....1..1..2....1..1..2....0..0..1....1..1..1

CROSSREFS

Sequence in context: A017534 A120904 A038596 * A289338 A256979 A293477

Adjacent sequences: A250985 A250986 A250987 * A250989 A250990 A250991

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved