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A208632 Number of n X n 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
1, 5, 32, 225, 1652, 12404, 94320, 722733, 5565560, 43005391, 333132384, 2585476348, 20097106512, 156418938680, 1218807197408, 9506457334965, 74216779041840, 579903491112365, 4534776883051800, 35488119754971345 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208637

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A305312 A199486 A277756 * A065071 A153396 A146965

Adjacent sequences:  A208629 A208630 A208631 * A208633 A208634 A208635

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 29 2012

STATUS

approved

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Last modified August 3 20:43 EDT 2021. Contains 346441 sequences. (Running on oeis4.)