# A120766 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 6 5 12 6 36 7 86 8 270 9 746 10 2554 11 8032 12 29716 13 103482 14 409242 15 1550850 16 6508702 17 26509428 18 117368404 19 508962350 20 2365560998 21 10842378698 22 52685516658 23 253754085960 24 1284660919140 25 6471281910962 26 34031293950258