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A257360 Number of (n+2)X(7+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
674856, 451584, 475608, 1249924, 2980712, 6012304, 12278736, 30603024, 76329692, 159516900, 325547732, 771395076, 1870800360, 4019813604, 8515864500, 19860701184, 46654887392, 102038080356, 221226236476, 508023966564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 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>43

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A068248 A206324 A216000 * A251884 A237005 A205244

Adjacent sequences:  A257357 A257358 A257359 * A257361 A257362 A257363

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2015

STATUS

approved

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Last modified September 25 11:39 EDT 2021. Contains 347654 sequences. (Running on oeis4.)