A318597 Number of n-member subsets of [9*n] whose elements sum to a multiple of nine.

1, 1, 17, 327, 6545, 135751, 2869719, 61474519, 1329890705, 28987537806, 635627275767, 14005614014756, 309847743790935, 6878045467021470, 153121753939078375, 3417374882384868702, 76435265515004093841, 1712879663609111933495, 38450113512250685307822

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..735

Example

a(2) = 17: {1,8}, {1,17}, {2,7}, {2,16}, {3,6}, {3,15}, {4,5}, {4,14}, {5,13}, {6,12}, {7,11}, {8,10}, {9,18}, {10,17}, {11,16}, {12,15}, {13,14}.

Crossrefs

Column k=9 of A318557.

Sequence in context: A029535 A099275 A299706 * A142933 A180676 A136270

Adjacent sequences: A318594 A318595 A318596 * A318598 A318599 A318600

Keyword

nonn

Author

Alois P. Heinz, Aug 29 2018

Status

approved