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A234653 Number of (n+1)X(3+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant stress 1X1 tilings) 1
3264, 9616, 28496, 94432, 315024, 1148176, 4196144, 16491760, 64635984, 269420656, 1113440816, 4854540592, 20870725584, 94119170416, 416524927664, 1926045742000, 8704759565904, 41004476986096, 188158197010736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234658

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +83*a(n-2) -804*a(n-3) -2479*a(n-4) +34112*a(n-5) +22457*a(n-6) -798036*a(n-7) +453896*a(n-8) +11262032*a(n-9) -15161188*a(n-10) -98135856*a(n-11) +191644944*a(n-12) +513355968*a(n-13) -1327868352*a(n-14) -1430555904*a(n-15) +5245827840*a(n-16) +1148359680*a(n-17) -11006668800*a(n-18) +3284582400*a(n-19) +9455616000*a(n-20) -5971968000*a(n-21)

EXAMPLE

Some solutions for n=4

..5..2..3..2....4..4..4..4....2..5..0..5....1..3..0..4....0..4..4..4

..3..4..1..4....0..4..0..4....4..3..2..3....3..1..2..2....4..4..0..4

..3..0..1..0....1..1..1..1....2..5..0..5....2..4..1..5....5..1..1..1

..2..3..0..3....0..4..0..4....2..1..0..1....4..2..3..3....4..4..0..4

..3..0..1..0....4..4..4..4....5..0..3..0....1..3..0..4....0..4..4..4

CROSSREFS

Sequence in context: A137836 A251919 A338071 * A254492 A254485 A253857

Adjacent sequences:  A234650 A234651 A234652 * A234654 A234655 A234656

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2013

STATUS

approved

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Last modified December 7 13:08 EST 2021. Contains 349581 sequences. (Running on oeis4.)