A201979 Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards

4, 304, 117744, 91893727, 48452117136, 13486744809160, 2238761872232964, 248685266018356303, 19939344176339744246, 1214420344528171330419, 58291620982242700295226, 2267753515670520458933950

Offset

1,1

Comments

Column 6 of A201981

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for n=2
..3..3..3..3..3..3....0..1..2..2..2..2....0..0..1..1..1..1....1..1..3..3..3..3
..3..3..3..3..3..3....3..2..0..0..0..0....3..3..0..0..0..0....3..3..0..0..0..0

Crossrefs

Sequence in context: A128904 A001537 A279576 * A280792 A027512 A153220

Adjacent sequences: A201976 A201977 A201978 * A201980 A201981 A201982

Keyword

nonn

Author

R. H. Hardin Dec 07 2011

Status

approved