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A250968 Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
172, 1945, 22048, 249921, 2833397, 32124018, 364210219, 4129278507, 46816221866, 530784935436, 6017842440934, 68228062145830, 773544424316648, 8770159340495832, 99432808820402153, 1127332250873994176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A250973

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -68*a(n-2) +210*a(n-3) -492*a(n-4) +705*a(n-5) -675*a(n-6) +389*a(n-7) -120*a(n-8) +20*a(n-9)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A234992 A213992 A214115 * A264213 A250340 A035828

Adjacent sequences:  A250965 A250966 A250967 * A250969 A250970 A250971

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified May 21 03:13 EDT 2022. Contains 353886 sequences. (Running on oeis4.)