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A251005 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than the absolute difference of its antidiagonal elements 1
4083, 218298, 11671623, 623999793, 33363057374, 1783834023550, 95376750510010, 5099532967837334, 272658056636328001, 14578279676192568678, 779460690932745520038, 41675628506308185007390, 2228281723639205270839345 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251010

LINKS

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

FORMULA

Empirical: a(n) = 81*a(n-1) -1954*a(n-2) +32379*a(n-3) -419520*a(n-4) +4000383*a(n-5) -27981900*a(n-6) +149000935*a(n-7) -627790962*a(n-8) +2173730790*a(n-9) -6430085803*a(n-10) +16294231907*a(n-11) -32054037021*a(n-12) +35251149270*a(n-13) +27785627597*a(n-14) -214291598331*a(n-15) +474340001188*a(n-16) -525110612953*a(n-17) -51492530582*a(n-18) +1353650012855*a(n-19) -2781865247427*a(n-20) +3444068301525*a(n-21) -3009309907241*a(n-22) +1966627276737*a(n-23) -984303214776*a(n-24) +380879357640*a(n-25) -116690528485*a(n-26) +31239482235*a(n-27) -8714904964*a(n-28) +2491548140*a(n-29) -492231312*a(n-30) +38390400*a(n-31)

EXAMPLE

Some solutions for n=1

..0..2..1..0....1..2..2..2....2..0..1..0....0..0..1..1....0..0..1..2

..2..1..1..2....1..0..2..0....2..1..2..2....0..2..1..1....0..2..1..0

CROSSREFS

Sequence in context: A221452 A233985 A126822 * A256028 A063889 A257824

Adjacent sequences:  A251002 A251003 A251004 * A251006 A251007 A251008

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified August 14 02:40 EDT 2022. Contains 356109 sequences. (Running on oeis4.)