# A005313 (b-file synthesized from sequence entry) 1 1 2 3 3 6 4 13 5 29 6 70 7 175 8 449 9 1164 10 3035 11 7931 12 20748 13 54301 14 142143 15 372114 16 974185 17 2550425 18 6677074 19 17480779 20 45765245 21 119814936 22 313679543 23 821223671 24 2149991448 25 5628750649 26 14736260475 27 38580030750 28 101003831749 29 264431464469 30 692290561630 31 1812440220391 32 4745030099513