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A253353 Number of (4+1)X(n+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
335, 3192, 30920, 305872, 3006936, 29746140, 294030700, 2909622092, 28790285676, 284932211532, 2819926224684, 27909384512908, 276225964612076, 2733896477818444, 27058289111384492, 267805400759163404 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A253350

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -73*a(n-2) -256*a(n-3) +2060*a(n-4) -1216*a(n-5) -12612*a(n-6) +18224*a(n-7) +20992*a(n-8) -40064*a(n-9) -9984*a(n-10) +24576*a(n-11) for n>15

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A038648 A224533 A253346 * A204612 A204796 A137522

Adjacent sequences:  A253350 A253351 A253352 * A253354 A253355 A253356

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2014

STATUS

approved

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Last modified June 12 08:13 EDT 2021. Contains 344943 sequences. (Running on oeis4.)