# A124704 (b-file synthesized from sequence entry) 0 1 1 11 2 31 3 71 4 187 5 491 6 1327 7 3623 8 10003 9 27827 10 77911 11 219263 12 619747 13 1758131 14 5003239 15 14276831 16 40836163 17 117049091 18 336123463 19 966831503 20 2785160227 21 8034032147 22 23203096519 23 67087148063 24 194165268355 25 562477731491