# A353028 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 5 4 15 5 47 6 156 7 527 8 1826 9 6407 10 22762 11 81587 12 294711 13 1070973 14 3912808 15 14358493 16 52893647 17 195498831 18 724704974 19 2693397035 20 10033263089 21 37452388361 22 140063288728