# A153294 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 18
4 86
5 427
6 2180
7 11373
8 60380
9 325259
10 1773842
11 9776637
12 54380144
13 304905223
14 1721650832
15 9782051362
16 55888463214
17 320898932595
18 1850762866662
19 10717217871255
20 62287285235230
21 363212668363520
22 2124430957852380