# A148072 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 9 5 21 6 56 7 148 8 421 9 1207 10 3535 11 10407 12 31879 13 97111 14 304344 15 958636 16 3045621 17 9696563 18 31478459 19 101764723 20 334038583 21 1100234409 22 3639933291 23 12057585459 24 40418753669 25 135042191401 26 455549125751 27 1540601216083 28 5223311667307 29 17725604119599 30 60646085848546 31 206928271796266 32 710805289086933