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A235096 Number of (n+1) X (6+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
26164, 39884, 63884, 121768, 238060, 524728, 1160340, 2765568, 6585764, 16502816, 41438468, 108250824, 284408956, 773062784, 2118218748, 5982595008, 17037956524, 49833980552, 146749793588, 442059707872, 1337246953540 (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:
4 2 5 2 3 2 5 3 4 1 4 3 4 2 1 3 0 3 0 3 0
3 5 4 5 2 5 4 4 1 2 1 4 1 3 4 2 3 2 3 2 3
4 2 5 2 3 2 5 3 4 1 4 3 4 2 3 5 2 5 2 5 2
3 5 4 5 2 5 4 4 1 2 1 4 1 3 4 2 3 2 3 2 3
2 0 3 0 1 0 3 2 3 0 3 2 3 1 2 4 1 4 1 4 1
CROSSREFS
Column 6 of A235098.
Sequence in context: A236488 A235435 A250972 * A235900 A245787 A034622
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2014
STATUS
approved

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Last modified July 22 06:32 EDT 2024. Contains 374481 sequences. (Running on oeis4.)