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A234487 Number of (n+1)X(5+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
14402, 51950, 187196, 677138, 2455350, 8928348, 32545706, 118945534, 435728940, 1600124066, 5889188814, 21725555324, 80316758842, 297580824166, 1104798114372, 4110348767602, 15322030940326, 57230791424428 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A234490

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 21*a(n-1) -128*a(n-2) -301*a(n-3) +6470*a(n-4) -16377*a(n-5) -92720*a(n-6) +529264*a(n-7) +144134*a(n-8) -6281248*a(n-9) +8587390*a(n-10) +35733302*a(n-11) -92619285*a(n-12) -93289189*a(n-13) +447345822*a(n-14) +55762321*a(n-15) -1262355944*a(n-16) +278493999*a(n-17) +2300746886*a(n-18) -753516820*a(n-19) -2817152264*a(n-20) +837146044*a(n-21) +2311698968*a(n-22) -448826360*a(n-23) -1224869744*a(n-24) +85822528*a(n-25) +391294592*a(n-26) +16553184*a(n-27) -67375296*a(n-28) -8961408*a(n-29) +4757760*a(n-30) +967680*a(n-31)

EXAMPLE

Some solutions for n=3

..2..0..2..0..0..0....2..0..0..3..0..1....2..3..2..0..3..0....3..0..3..1..3..0

..1..1..1..1..3..1....3..3..1..2..1..0....2..1..2..2..3..2....2..1..2..2..2..1

..1..3..1..3..3..3....1..3..3..2..3..0....1..2..1..3..2..3....0..1..0..2..0..1

..0..0..0..0..2..0....1..1..3..0..3..2....3..2..3..3..0..3....3..2..3..3..3..2

CROSSREFS

Sequence in context: A203729 A144649 A166371 * A234977 A250960 A238060

Adjacent sequences:  A234484 A234485 A234486 * A234488 A234489 A234490

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved

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Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)