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A256730 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum zero and no antidiagonal sum three 1
13056, 186624, 2267136, 30294016, 388595712, 5101387776, 65927512064, 859759181824, 11156772618240, 145188233150464, 1886191427256320, 24528150473998336, 318786248816721920, 4144523593872572416 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 6 10:14 EDT 2020. Contains 336245 sequences. (Running on oeis4.)