A258677 Number of (n+2)X(4+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum

43264, 456976, 5973136, 78074896, 916151824, 10750371856, 133333061904, 1653682833936, 19942405038864, 240493225528336, 2942195865808144, 35994845566901776, 437158394693484304, 5309300791297536016

Offset

1,1

Comments

Column 4 of A258681

Links

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

Formula

Empirical: a(n) = 17*a(n-1) -68*a(n-2) +132*a(n-3) +5848*a(n-4) -103512*a(n-5) +338752*a(n-6) +491712*a(n-7) -11065856*a(n-8) +134969856*a(n-9) -439611392*a(n-10) -456462336*a(n-11) +6754926592*a(n-12) -57485033472*a(n-13) +186243874816*a(n-14) +80580968448*a(n-15) -1515720802304*a(n-16) +8690463670272*a(n-17) -27366457868288*a(n-18) +6046240210944*a(n-19) +106652627894272*a(n-20) -448600744132608*a(n-21) +1337006139375616*a(n-22) -844424930131968*a(n-23) -2251799813685248*a(n-24) +6755399441055744*a(n-25) -18014398509481984*a(n-26) +18014398509481984*a(n-27)

Example

Some solutions for n=1
..0..0..1..0..0..0....1..1..0..0..1..1....1..1..1..0..0..0....0..1..1..0..1..0
..0..0..1..0..1..0....0..1..0..0..0..1....1..1..0..0..1..0....1..0..1..1..1..0
..0..0..0..1..1..0....1..1..1..1..1..1....1..0..0..0..1..1....1..0..0..1..1..0

Crossrefs

Cf. A258681

Sequence in context: A146074 A321038 A256767 * A184382 A126771 A103875

Adjacent sequences: A258674 A258675 A258676 * A258678 A258679 A258680

Keyword

nonn

Author

R. H. Hardin, Jun 07 2015

Status

approved