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A224184
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Number of n X n 0..2 arrays with rows unimodal and columns nondecreasing
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1
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3, 36, 684, 15779, 408222, 11444292, 340780382, 10635858679, 344674481333, 11518916935288, 394956511554556, 13839075880034056, 494013661434533634, 17921279299283914328, 659361786079631903704, 24563166523294240335463
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..1..0....0..1..0....2..0..0....0..0..2....0..0..1....1..0..0....0..2..0
..0..1..0....0..1..1....2..0..0....2..2..2....0..0..1....1..0..0....2..2..1
..1..2..0....1..1..1....2..1..1....2..2..2....1..1..2....2..0..0....2..2..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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