# A047177 (b-file synthesized from sequence entry) 1 0 2 0 3 0 4 0 5 1 6 4 7 12 8 30 9 60 10 121 11 205 12 385 13 630 14 1260 15 2156 16 4711 17 8260 18 18340 19 31620 20 68772 21 115995 22 250185 23 418825 24 914485 25 1535391 26 3405402 27 5728086 28 12788516 29 21448791 30 47902764 31 80006668 32 178864378 33 298009048 34 668688388