A318598 Number of n-member subsets of [10*n] whose elements sum to a multiple of ten.

1, 1, 18, 406, 9158, 211880, 5005980, 119877472, 2898762854, 70625252863, 1731030733840, 42634215112710, 1054285960975268, 26159486052576800, 650961394904288192, 16239221627803363280, 405994987399334500710, 10169699086799914175514, 255172150241034559336782

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..710

Example

a(2) = 18: {1,9}, {1,19}, {2,8}, {2,18}, {3,7}, {3,17}, {4,6}, {4,16}, {5,15}, {6,14}, {7,13}, {8,12}, {9,11}, {10,20}, {11,19}, {12,18}, {13,17}, {14,16}.

Crossrefs

Column k=10 of A318557.

Sequence in context: A116421 A298465 A260655 * A215229 A172135 A005477

Adjacent sequences: A318595 A318596 A318597 * A318599 A318600 A318601

Keyword

nonn

Author

Alois P. Heinz, Aug 29 2018

Status

approved