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A251245 Number of (n+1)X(4+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements 1
42525, 7530633, 1333268433, 236035946835, 41786532918513, 7397658897202791, 1309640978922956217, 231851661109674461595, 41045747464323823946625, 7266514192354994223128283, 1286423850879599442443706681 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A251249
LINKS
FORMULA
Empirical: a(n) = 243*a(n-1) -12974*a(n-2) +236322*a(n-3) -1209024*a(n-4) -2903472*a(n-5) +39230408*a(n-6) +36692136*a(n-7) -81363872*a(n-8) -13350417264*a(n-9) -31190025008*a(n-10) +131686132896*a(n-11) +557194797504*a(n-12) +324811988352*a(n-13) +44140742400*a(n-14) +1172245859712*a(n-15) +1535371786496*a(n-16) -166686769152*a(n-17) +514029736704*a(n-18) +114288768000*a(n-19) -43963103232*a(n-20) -23758092288*a(n-21) -13501624320*a(n-22) +51425280*a(n-23) +35831808*a(n-24)
EXAMPLE
Some solutions for n=1
..0..1..2..2..1....2..2..0..1..2....0..1..1..0..2....0..0..1..2..0
..0..1..2..2..2....1..0..1..2..1....0..2..2..1..2....0..0..0..2..1
CROSSREFS
Sequence in context: A217164 A062694 A210264 * A187959 A253521 A254419
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved

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Last modified July 16 12:01 EDT 2024. Contains 374348 sequences. (Running on oeis4.)