# A073361 (b-file synthesized from sequence entry) 1 1 2 5 3 15 4 31 5 65 6 105 7 151 8 275 9 420 10 631 11 695 12 1050 13 1411 14 1685 15 2385 16 2941 17 3425 18 4410 19 5326 20 6995 21 7350 22 9316 23 10880