# A109318 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 36
4 176
5 920
6 5080
7 29336
8 175752
9 1085496
10 6877240
11 44518520
12 293513784
13 1965904984
14 13348449784
15 91723622936
16 636923476728
17 4463989946072
18 31545992160568
19 224580029779608
20 1609455072125816
21 11603437881340888