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A257014 Number of (n+2)X(1+2) 0..2 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum 1
15066, 311364, 6508512, 136048896, 2834352000, 59049000000, 1231525944000, 25684705088064, 535477332658752, 11163685656822336, 232773660245307456, 4853556304757222976, 101196180631622776896, 2109930601689036657216 (list; graph; refs; listen; history; text; internal format)
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: A187423 A186215 A257017 * A237335 A206410 A283527

Adjacent sequences:  A257011 A257012 A257013 * A257015 A257016 A257017

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 14 2015

STATUS

approved

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Last modified August 7 11:56 EDT 2020. Contains 336276 sequences. (Running on oeis4.)