# A123467 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 9 5 20 6 48 7 115 8 286 9 719 10 1842 11 4766 12 12486 13 32973 14 87811 15 235381 16 634847 17 1721159 18 4688676 19 12826228 20 35221832 21 97055181 22 268282855 23 743724984 24 2067174645 25 5759636510 26 16083734329 27 45007066269 28 126186554308 29 354426847597