# A144841 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 11 5 41 6 121 7 316 8 757 9 1961 10 6281 11 22166 12 74031 13 221937 14 596961 15 1460096 16 3294761 17 6945521 18 13818417 19 26161386 20 47446611