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A250922 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element 1
2007, 50722, 1320397, 34521887, 899626256, 23390844328, 607786907671, 15792648591051, 410386735455738, 10664677285369172, 277143750432312194, 7202144730444536277, 187162132018563957375, 4863780170797367703069 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A250927

LINKS

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

FORMULA

Empirical: a(n) = 81*a(n-1) -2899*a(n-2) +63295*a(n-3) -958285*a(n-4) +10756670*a(n-5) -93330409*a(n-6) +644640204*a(n-7) -3624496674*a(n-8) +16880394940*a(n-9) -66023717068*a(n-10) +219240302561*a(n-11) -623358921354*a(n-12) +1527544435817*a(n-13) -3241977665792*a(n-14) +5979956364272*a(n-15) -9608041848406*a(n-16) +13461986448007*a(n-17) -16448861092094*a(n-18) +17508255649822*a(n-19) -16196842918537*a(n-20) +12974801039902*a(n-21) -8952649323986*a(n-22) +5282187628341*a(n-23) -2638768086999*a(n-24) +1101316093488*a(n-25) -377022705948*a(n-26) +103145374080*a(n-27) -21690899280*a(n-28) +3292887168*a(n-29) -321226560*a(n-30) +15116544*a(n-31)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A189353 A162244 A295701 * A201343 A219083 A258553

Adjacent sequences:  A250919 A250920 A250921 * A250923 A250924 A250925

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2014

STATUS

approved

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Last modified June 29 05:44 EDT 2022. Contains 354910 sequences. (Running on oeis4.)