A235072 - OEIS

A235072

Number of (n+1) X (1+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

288, 1828, 11976, 79848, 534008, 3577048, 23966856, 160608008, 1076281720, 7212695512, 48335145928, 323918665128, 2170711158968, 14547055076472, 97485766228616, 653302411496072, 4378046742831096, 29339549842789400

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OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 61*a(n-2) -813*a(n-4) +4271*a(n-6) -9694*a(n-8) +8264*a(n-10) -1536*a(n-12).

EXAMPLE

Some solutions for n=4:

0 2 0 5 2 3 1 3 4 3 3 5 2 3 3 1 2 7 6 7

2 1 1 3 3 7 7 6 3 5 5 4 7 5 6 7 3 5 2 0

5 7 7 6 4 5 2 4 1 0 6 2 2 3 0 4 7 6 0 1

6 5 0 2 6 4 1 6 3 5 5 4 3 1 5 6 0 2 4 2

2 4 1 0 1 2 2 4 4 3 1 3 1 2 3 7 7 6 5 6

CROSSREFS

Column 1 of A235078.

Sequence in context: A128392 A296784 A235078 * A235769 A049230 A322677

Adjacent sequences: A235069 A235070 A235071 * A235073 A235074 A235075

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved