# A003774 (b-file synthesized from sequence entry)
1 4
2 48
3 672
4 8496
5 106944
6 1349760
7 17032800
8 214925952
9 2712031104
10 34221651456
11 431824387584
12 5448956749824
13 68757417818112
14 867612411420672
15 10947928532312064
16 138145948088696832