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

674856, 451584, 475608, 1249924, 2980712, 6012304, 12278736, 30603024, 76329692, 159516900, 325547732, 771395076, 1870800360, 4019813604, 8515864500, 19860701184, 46654887392, 102038080356, 221226236476, 508023966564

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