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A235094 Number of (n+1) X (4+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1
2580, 4820, 9460, 21264, 48844, 121768, 306532, 813576, 2175660, 6047320, 16929348, 48865480, 141911020, 422528408, 1263337092, 3855011816, 11785843980, 36637377848, 113858844484, 358743669288, 1127952290764, 3587979285400 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) +6*a(n-2) -279*a(n-3) +514*a(n-4) +3213*a(n-5) -10656*a(n-6) -15267*a(n-7) +92760*a(n-8) +195*a(n-9) -435144*a(n-10) +318243*a(n-11) +1151658*a(n-12) -1467393*a(n-13) -1629840*a(n-14) +3140943*a(n-15) +944545*a(n-16) -3513288*a(n-17) +172122*a(n-18) +2004312*a(n-19) -330148*a(n-20) -568464*a(n-21) +76440*a(n-22) +65520*a(n-23).
EXAMPLE
Some solutions for n=4:
5 0 3 0 5 2 5 3 5 4 2 5 2 5 3 3 4 3 2 4
4 3 2 3 4 1 0 2 0 3 4 3 4 3 5 0 5 0 3 1
2 5 0 5 2 0 3 1 3 2 2 5 2 5 3 2 3 2 1 3
3 2 1 2 3 1 0 2 0 3 3 2 3 2 4 0 5 0 3 1
2 5 0 5 2 0 3 1 3 2 1 4 1 4 2 3 4 3 2 4
CROSSREFS
Column 4 of A235098.
Sequence in context: A034415 A201510 A303400 * A171257 A252159 A252167
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2014
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)