# A355520 (b-file synthesized from sequence entry) 1 2 2 4 3 8 4 16 5 32 6 62 7 116 8 206 9 350 10 566 11 886 12 1334 13 1974 14 2846 15 3978 16 5472 17 7398 18 9854 19 12964 20 16804 21 21524