A184235 Number of strings of numbers x(i=1..n) in 0..4 with sum i^2*x(i)^2 equal to n^2*16

1, 1, 1, 1, 3, 15, 31, 119, 555, 2138, 9548, 33391, 136682, 468971, 1753525, 5789709, 19745186, 63565260, 203046061, 638284176, 1947963410, 5979604119, 17725544038, 53252284414, 155128241215, 456635560332, 1314718658955, 3796821176997

Offset

1,5

Comments

Column 4 of A184240

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

All solutions for n=5
..2....0....0
..1....0....0
..2....4....0
..4....4....0
..2....0....4

Crossrefs

Sequence in context: A031039 A358804 A152813 * A086381 A031091 A211441

Adjacent sequences: A184232 A184233 A184234 * A184236 A184237 A184238

Keyword

nonn

Author

R. H. Hardin Jan 10 2011

Status

approved