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A256743 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0 1
857, 1564, 2992, 3752, 9112, 16560, 38376, 61376, 135552, 202832, 517472, 837568, 2004832, 3082192, 7494688, 11500352, 29366208, 44880848, 112714720, 169674112, 434165792, 652380752, 1696204320, 2515078784, 6570529664, 9672961104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A256748

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +4*a(n-2) +2*a(n-3) -5*a(n-4) -17*a(n-5) +20*a(n-6) -40*a(n-7) -28*a(n-8) +16*a(n-9) +176*a(n-10) +128*a(n-11) -256*a(n-12) for n>17

EXAMPLE

Some solutions for n=4

..1..0..0..1..1....1..0..0..1..0....1..0..1..1..0....0..0..1..0..1

..0..1..1..0..0....1..1..1..1..1....1..0..0..1..1....0..0..1..0..0

..1..0..0..1..1....1..0..0..1..0....0..1..1..1..0....1..1..1..1..1

..1..1..1..1..0....1..0..0..1..0....1..0..0..1..1....0..0..1..0..0

..1..0..0..1..1....0..1..1..0..1....1..1..1..1..0....1..0..1..0..1

..0..1..0..1..0....1..0..0..1..0....1..0..0..1..0....1..1..0..1..0

CROSSREFS

Cf. A256748

Sequence in context: A234885 A251453 A087002 * A307330 A046394 A163304

Adjacent sequences:  A256740 A256741 A256742 * A256744 A256745 A256746

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2015

STATUS

approved

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Last modified August 11 03:41 EDT 2022. Contains 356046 sequences. (Running on oeis4.)