# A136794 (b-file synthesized from sequence entry)
1 2
2 8
3 52
4 376
5 2998
6 25256
7 222128
8 2013680
9 18691522
10 176743160
11 1696546848
12 16488151400
13 161919802562
14 1604274741608
15 16016845623764
16 160977882238968
17 1627406260427490
18 16537733701226936