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 A235270 Number of (n+1) X (n+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). 0
 40, 208, 632, 2344, 6232, 20440, 51800, 160888, 401560, 1215928, 3032792, 9077944, 22776472, 67860280 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A235280. LINKS FORMULA Empirical: a(n) = a(n-1) +23*a(n-2) -23*a(n-3) -200*a(n-4) +200*a(n-5) +820*a(n-6) -820*a(n-7) -1584*a(n-8) +1584*a(n-9) +1152*a(n-10) -1152*a(n-11) [see A235280 for an assumption]. EXAMPLE Some solutions for n=4: 4 1 4 2 4 4 1 3 1 4 2 4 1 4 1 0 3 0 2 0 0 2 0 3 0 1 3 0 3 1 4 1 3 1 3 3 1 3 0 3 4 1 4 2 4 4 1 3 1 4 2 4 1 4 1 0 3 0 2 0 1 3 1 4 1 1 3 0 3 1 3 0 2 0 2 4 2 4 1 4 4 1 4 2 4 3 0 2 0 3 2 4 1 4 1 0 3 0 2 0 CROSSREFS Sequence in context: A187379 A077818 A247405 * A181637 A111176 A072108 Adjacent sequences: A235267 A235268 A235269 * A235271 A235272 A235273 KEYWORD nonn AUTHOR R. H. Hardin, Jan 05 2014 STATUS approved

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Last modified December 4 08:59 EST 2022. Contains 358552 sequences. (Running on oeis4.)