# A019243 (b-file synthesized from sequence entry) 3 0 4 0 5 2 6 8 7 6 8 16 9 58 10 120 11 254 12 668 13 1616 14 3750 15 9540 16 23832 17 59628 18 151807 19 392948 20 1014372 21 2648282 22 6968089 23 18372218 24 48650007 25 129494286 26 345288143 27 922430248 28 2471294134 29 6633522886 30 17828876698 31 47998957546