A257014 Number of (n+2)X(1+2) 0..2 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum

15066, 311364, 6508512, 136048896, 2834352000, 59049000000, 1231525944000, 25684705088064, 535477332658752, 11163685656822336, 232773660245307456, 4853556304757222976, 101196180631622776896, 2109930601689036657216

Offset

1,1

Comments

Column 1 of A257017

Links

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

Formula

Empirical: a(n) = 9*a(n-1) +2592*a(n-3) +40824*a(n-4) +192456*a(n-5) +1679616*a(n-6) -90699264*a(n-8) -272097792*a(n-9)

Example

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

Crossrefs

Cf. A257017

Sequence in context: A186215 A347077 A257017 * A237335 A206410 A283527

Adjacent sequences: A257011 A257012 A257013 * A257015 A257016 A257017

Keyword

nonn

Author

R. H. Hardin, Apr 14 2015

Status

approved