# A123046 (b-file synthesized from sequence entry) 0 0 1 1 2 4 3 6 4 23 5 52 6 194 7 586 8 2131 9 7286 10 26524 11 95326 12 350738 13 1290556 14 4798174 15 17895736 16 67127315 17 252645136 18 954510114 19 3616814566 20 13744183772 21 52357696956 22 199912348954 23 764877654106 24 2932035552786 25 11258999068468 26 43303860638644 27 166799986203766