# A153903 (b-file synthesized from sequence entry) 0 1 1 2 2 2 3 3 4 3 5 7 6 10 7 21 8 34 9 88 10 150 11 421 12 807 13 2708 14 6019 15 22444 16 58037 17 245472 18 706322 19 3364913 20 10967191 21 59955069 22 222028350 23 1374087876 24 5812458172 25 40846719268 26 195779164954 27 1558347753536 28 8466932734756 29 76665491618022 30 472779311230382