# A111713 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 14 4 108 5 930 6 8700 7 86598 8 904176 9 9804516 10 109624536 11 1257136130 12 14726063264 13 175650153588 14 2128038439176 15 26133761328150 16 324786698542440 17 4079191750094776 18 51716838331485472 19 661227615895716180 20 8518677674587163584