# A019213 (b-file synthesized from sequence entry) 3 0 4 1 5 4 6 1 7 10 8 28 9 48 10 72 11 234 12 590 13 1194 14 3128 15 8624 16 20646 17 53656 18 142760 19 368944 20 960041 21 2535290 22 6664310 23 17553688 24 46472243 25 123351404 26 327633746 27 872745824 28 2330569953 29 6234547154 30 16709193186 31 44876578602