A234436 - OEIS

A234436

Number of (n+1) X (1+1) 0..2 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1 (constant-stress 1 X 1 tilings).

32, 120, 448, 1680, 6272, 23520, 87808, 329280, 1229312, 4609920, 17210368, 64538880, 240945152, 903544320, 3373232128, 12649620480, 47225249792, 177094686720, 661153497088, 2479325614080, 9256148959232, 34710558597120

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OFFSET

1,1

COMMENTS

Column 1 of A234443.

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-2).

EXAMPLE

Some solutions for n=5:

0 1 1 0 0 1 2 1 0 1 1 0 0 0 1 1 0 1 2 0

0 0 2 2 0 0 0 0 0 2 1 1 1 0 1 0 2 2 1 0

1 2 1 2 2 1 1 2 0 1 2 1 2 2 2 2 0 1 2 2

0 0 0 2 2 2 1 1 0 0 2 0 0 1 2 1 0 0 2 1

0 1 0 1 2 1 2 1 0 1 1 0 1 1 2 2 2 1 0 0

1 1 0 0 0 0 1 1 2 2 1 1 1 2 0 1 2 0 1 2

CROSSREFS

Column 1 of A234443.

Sequence in context: A231527 A298201 A234443 * A297461 A297698 A223314

Adjacent sequences: A234433 A234434 A234435 * A234437 A234438 A234439

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved