A172666 Number of 3*n X n 0..2 arrays with row sums 7 and column sums 21

0, 0, 0, 369600, 8432855707512236000, 2333327772435239191435579651896000, 7912042661932746320895028318655823357822209601009, 288661272140059402021783839980598829830361488723258925444306851840

Offset

1,4

Links

R. H. Hardin, Table of n, a(n) for n=1..10

Crossrefs

Sequence in context: A172582 A172682 A172778 * A251209 A252800 A291638

Adjacent sequences: A172663 A172664 A172665 * A172667 A172668 A172669

Keyword

nonn

Author

R. H. Hardin Feb 06 2010

Status

approved