# A107321 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 8 5 14 6 42 7 79 8 254 9 506 10 1702 11 3548 12 12320 13 26666 14 94794 15 211751 16 766362 17 1758352 18 6453812 19 15150922 20 56238710 21 134659120