# A022945 (b-file synthesized from sequence entry) 1 1 2 4 3 9 4 15 5 22 6 30 7 40 8 51 9 63 10 76 11 90 12 106 13 123 14 141 15 160 16 180 17 201 18 224 19 248 20 273 21 299