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A257356 Number of (n+2)X(3+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
3108, 6724, 17056, 45796, 112236, 234256, 475608, 1136356, 2763008, 5914624, 12499644, 29203216, 68721712, 150160516, 325035968, 747038224, 1727481692, 3815779984, 8381071304, 19092054276, 43659093360, 97078357476, 215135035828 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A257361

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-3) +16*a(n-4) +8*a(n-5) +4*a(n-6) +2*a(n-7) +18*a(n-8) +6*a(n-9) -4*a(n-10) -18*a(n-11) -141*a(n-12) -60*a(n-13) +48*a(n-14) +18*a(n-15) -117*a(n-16) -66*a(n-17) +48*a(n-19) +279*a(n-20) +108*a(n-21) -12*a(n-22) -12*a(n-23) +15*a(n-24) +36*a(n-25) +16*a(n-26) -6*a(n-27) -36*a(n-28) -8*a(n-29) -4*a(n-30) -2*a(n-31) -a(n-32) -2*a(n-33) +a(n-36) for n>39

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A234265 A090056 A229410 * A187593 A230923 A137839

Adjacent sequences:  A257353 A257354 A257355 * A257357 A257358 A257359

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2015

STATUS

approved

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Last modified October 1 11:02 EDT 2022. Contains 357147 sequences. (Running on oeis4.)