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A235279
Number of (n+1) X (9+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings).
1
35200, 41500, 48328, 62800, 79480, 115480, 160888, 260680, 401560, 716200, 1215928, 2348200, 4345240, 8936680, 17733688, 38288680, 80144920, 179655400, 391244728, 902914600, 2024143000, 4777083880, 10935717688, 26248208680
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = a(n-1) +15*a(n-2) -15*a(n-3) -80*a(n-4) +80*a(n-5) +180*a(n-6) -180*a(n-7) -144*a(n-8) +144*a(n-9).
EXAMPLE
Some solutions for n=5:
0 4 0 1 0 2 0 3 0 4 1 3 1 3 1 3 1 4 1 3
4 3 4 0 4 1 4 2 4 3 3 0 3 0 3 0 3 1 3 0
0 4 0 1 0 2 0 3 0 4 0 2 0 2 0 2 0 3 0 2
4 3 4 0 4 1 4 2 4 3 3 0 3 0 3 0 3 1 3 0
0 4 0 1 0 2 0 3 0 4 1 3 1 3 1 3 1 4 1 3
4 3 4 0 4 1 4 2 4 3 4 1 4 1 4 1 4 2 4 1
CROSSREFS
Column 9 of A235280.
Sequence in context: A085545 A031855 A186567 * A358856 A133282 A257724
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2014
STATUS
approved