# A002921 (b-file synthesized from sequence entry) 0 1 1 12 2 132 3 1404 4 14652 5 151116 6 1546332 7 15734460 8 159425580 9 1609987708 10 16215457188 11 162961837500 12 1634743178420 13 16373484437340 14 163778159931180 15 1636328839130860