A256730 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum zero and no antidiagonal sum three

13056, 186624, 2267136, 30294016, 388595712, 5101387776, 65927512064, 859759181824, 11156772618240, 145188233150464, 1886191427256320, 24528150473998336, 318786248816721920, 4144523593872572416

Offset

1,1

Comments

Column 3 of A256735

Links

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

Formula

Empirical: a(n) = 16*a(n-1) -608*a(n-3) +2560*a(n-4) -20480*a(n-5) +41984*a(n-6) +190464*a(n-7) -286720*a(n-8) +1212416*a(n-9) -2686976*a(n-10) -11141120*a(n-11) +10485760*a(n-12) +8388608*a(n-13) +25165824*a(n-15) -16777216*a(n-16)

Example

Some solutions for n=2
..1..0..0..1..0....0..1..1..1..1....0..0..0..1..1....0..0..1..0..0
..1..1..1..0..0....1..0..1..0..1....0..1..1..1..1....1..0..1..0..1
..1..0..0..0..1....1..0..1..0..0....1..0..0..0..0....1..0..1..0..0
..0..1..0..0..0....0..0..0..1..1....0..1..1..0..0....1..0..0..1..1

Crossrefs

Cf. A256735

Sequence in context: A262659 A252638 A252191 * A234329 A165679 A111887

Adjacent sequences: A256727 A256728 A256729 * A256731 A256732 A256733

Keyword

nonn

Author

R. H. Hardin, Apr 09 2015

Status

approved