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

Author

Alois P. Heinz, Aug 29 2018

Keywords

• nonn

Examples

			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}.
		

Links

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

Crossrefs

Column k=10 of A318557.