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A256021 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 1 and no column sum 1 0
33, 164, 1689, 23134, 494704, 17064206, 904174706, 74064844601, 9413114643755, 1840791210516272, 554265737552127281, 257592212385874955248, 184567323274511744214582, 203714031594496792956553885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A256029

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

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

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

..1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1

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

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

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

CROSSREFS

Cf. A256029

Sequence in context: A086504 A233064 A183776 * A172077 A180943 A113752

Adjacent sequences:  A256018 A256019 A256020 * A256022 A256023 A256024

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 13 2015

STATUS

approved

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Last modified March 22 12:39 EDT 2019. Contains 321421 sequences. (Running on oeis4.)