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A257354 Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum 1
220, 784, 3108, 12100, 45684, 174724, 674856, 2585664, 9853288, 37724164, 144911780, 555167844, 2122710008, 8128825600, 31164354584, 119371632004, 456940637076, 1750016785924, 6704844968808, 25680650841664, 98339620401640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A257361

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +15*a(n-3) +75*a(n-4) +64*a(n-5) +86*a(n-6) +100*a(n-7) +440*a(n-8) +200*a(n-9) -344*a(n-10) -96*a(n-11) +1200*a(n-12) +800*a(n-13) -384*a(n-15) -256*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A258545 A257361 A258538 * A102073 A234969 A002025

Adjacent sequences:  A257351 A257352 A257353 * A257355 A257356 A257357

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2015

STATUS

approved

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Last modified December 6 16:26 EST 2021. Contains 349567 sequences. (Running on oeis4.)