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A234652 Number of (n+1)X(2+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant stress 1X1 tilings) 1
728, 2648, 9616, 37352, 144512, 593048, 2414992, 10359416, 43905728, 194994488, 851994256, 3886321592, 17372570432, 80869715768, 367672598032, 1738035049016, 8001387470528, 38267054762168, 177809954398096, 857989731643832 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A234658

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +59*a(n-2) -741*a(n-3) -680*a(n-4) +23970*a(n-5) -24980*a(n-6) -382080*a(n-7) +836736*a(n-8) +3002976*a(n-9) -9941184*a(n-10) -8688384*a(n-11) +53360640*a(n-12) -15759360*a(n-13) -107827200*a(n-14) +99532800*a(n-15)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A043487 A158395 A184077 * A050219 A051383 A293650

Adjacent sequences:  A234649 A234650 A234651 * A234653 A234654 A234655

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2013

STATUS

approved

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Last modified December 6 09:43 EST 2021. Contains 349563 sequences. (Running on oeis4.)