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A224184 Number of n X n 0..2 arrays with rows unimodal and columns nondecreasing 1
3, 36, 684, 15779, 408222, 11444292, 340780382, 10635858679, 344674481333, 11518916935288, 394956511554556, 13839075880034056, 494013661434533634, 17921279299283914328, 659361786079631903704, 24563166523294240335463 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A224190

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

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

CROSSREFS

Sequence in context: A296098 A224256 A223912 * A241996 A006587 A328122

Adjacent sequences:  A224181 A224182 A224183 * A224185 A224186 A224187

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 01 2013

STATUS

approved

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Last modified June 6 04:15 EDT 2020. Contains 334859 sequences. (Running on oeis4.)