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A234699 Number of (n+1)X(3+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
16848, 74308, 329984, 1558600, 7424496, 37338544, 189345872, 1006857472, 5389971408, 30077051488, 168561386384, 979772704480, 5704468149456, 34304416485664, 206090647457552, 1274575646527072, 7855291807049808 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234702

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..186

FORMULA

Empirical: a(n) = 20*a(n-1) +141*a(n-2) -5340*a(n-3) +5451*a(n-4) +616740*a(n-5) -2678805*a(n-6) -39706740*a(n-7) +278440182*a(n-8) +1491646680*a(n-9) -16092380232*a(n-10) -27470360160*a(n-11) +601403119168*a(n-12) -194332088960*a(n-13) -15257818574160*a(n-14) +26729605928640*a(n-15) +263906583339744*a(n-16) -801813357648000*a(n-17) -2982678610973184*a(n-18) +13948745101747200*a(n-19) +18588639920403456*a(n-20) -156794289434542080*a(n-21) -1681574850293760*a(n-22) +1140373919202508800*a(n-23) -1022866437252096000*a(n-24) -5015897891205120000*a(n-25) +8536532135362560000*a(n-26) +10656426280550400000*a(n-27) -31534442652303360000*a(n-28) +815374290124800000*a(n-29) +46191901645209600000*a(n-30) -31856483893248000000*a(n-31)

EXAMPLE

Some solutions for n=2

..7..1..6..5....5..5..5..0....6..5..6..5....6..0..3..2....5..0..3..3

..2..1..1..5....7..2..7..7....2..6..2..6....5..4..2..6....7..7..5..0

..3..7..2..1....1..1..1..6....3..2..3..2....7..1..4..3....6..1..4..4

CROSSREFS

Sequence in context: A061364 A203891 A088164 * A204639 A233986 A170797

Adjacent sequences:  A234696 A234697 A234698 * A234700 A234701 A234702

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2013

STATUS

approved

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Last modified September 21 14:54 EDT 2020. Contains 337272 sequences. (Running on oeis4.)