# A291877 (b-file synthesized from sequence entry) 1 1 2 4 3 7 4 14 5 23 6 32 7 47 8 68 9 93 10 120 11 153 12 198 13 255 14 318 15 399 16 480 17 579 18 700 19 835 20 1012 21 1201 22 1428