# A148681 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 22 5 66 6 227 7 748 8 2710 9 9643 10 35646 11 133338 12 506112 13 1938692 14 7546335 15 29463016 16 116453080 17 462871956 18 1851092051 19 7451911578 20 30144766089 21 122486787548 22 500198189286 23 2049540237382 24 8430872633779 25 34799109527697 26 144055056806443 27 598143461783294 28 2490167439891266