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A258540 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum equal to the central column sum 1
2520, 8836, 20736, 57600, 142544, 381924, 956736, 2496400, 6344576, 16467364, 42350672, 110082064, 285367424, 743652900, 1936887872, 5057485456, 13206499776, 34526842596, 90279314432, 236188224064, 617983034784 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A258545

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +9*a(n-2) -51*a(n-3) -20*a(n-4) +275*a(n-5) -65*a(n-6) -820*a(n-7) +465*a(n-8) +1485*a(n-9) -1180*a(n-10) -1685*a(n-11) +1685*a(n-12) +1180*a(n-13) -1485*a(n-14) -465*a(n-15) +820*a(n-16) +65*a(n-17) -275*a(n-18) +20*a(n-19) +51*a(n-20) -9*a(n-21) -4*a(n-22) +a(n-23) for n>26

EXAMPLE

Some solutions for n=4

..1..1..1..0..0....0..0..0..0..0....1..0..1..0..0....0..1..1..0..1

..1..1..0..1..0....1..1..1..1..1....1..0..1..0..1....1..1..0..0..0

..0..1..0..1..0....0..0..0..0..0....1..1..1..1..1....0..1..1..1..1

..1..0..1..0..1....1..1..1..1..1....0..1..0..1..0....1..1..0..0..1

..0..0..1..0..1....0..0..0..0..0....0..0..0..0..1....0..1..1..1..1

..0..0..0..0..0....0..0..0..0..0....0..1..1..1..1....1..1..0..1..1

CROSSREFS

Cf. A258545

Sequence in context: A094515 A179700 A066531 * A159214 A224542 A064592

Adjacent sequences:  A258537 A258538 A258539 * A258541 A258542 A258543

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 02 2015

STATUS

approved

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Last modified January 24 13:09 EST 2022. Contains 350538 sequences. (Running on oeis4.)