login
A377062
Number of inequivalent n X 4 nonnegative integer arrays with row sums 4 and column sums n up to permutations of rows and columns.
2
1, 1, 3, 9, 43, 147, 661, 2649, 10738, 40427, 146206, 498705, 1625621, 5049556, 15044485, 43044068, 118731621, 316347549, 816409799, 2044571309, 4979112445, 11810405775, 27331117859, 61792085482, 136670650003, 296071435108, 628900592847, 1311195696010, 2685731232674, 5409289235300, 10721363532282
OFFSET
0,3
EXAMPLE
The a(2) = 3 matrices are:
[2 2 0 0] [2 1 1 0] [1 1 1 1]
[0 0 2 2] [0 1 1 2] [1 1 1 1]
CROSSREFS
Column k=4 of A377060.
Sequence in context: A141774 A141349 A018427 * A275781 A199140 A154606
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Oct 14 2024
STATUS
approved