# A155198 (b-file synthesized from sequence entry)
0 1
1 8
2 72
3 656
4 5976
5 54440
6 495936
7 4517864
8 41156712
9 374928272
10 3415511160
11 31114528712
12 283446269568
13 2582130954824
14 23522624862984
15 214285754721680
16 1952094417358104
17 17783135510944616
18 162000314015859648