A201985 Number of nX3 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

8, 1170, 134217, 11648559, 803133854, 46034224561, 2263314310579, 97590406110264, 3751608445033000, 130228399017523112, 4123679601987935141, 120106074216408355193, 3240091181028424814518, 81435648130636028973623

Offset

1,1

Comments

Column 3 of A201989

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

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

Crossrefs

Sequence in context: A003767 A221084 A117084 * A301614 A180767 A240399

Adjacent sequences: A201982 A201983 A201984 * A201986 A201987 A201988

Keyword

nonn

Author

R. H. Hardin, Dec 07 2011

Status

approved