# A027171 (b-file synthesized from sequence entry)
0 1
1 10
2 42
3 156
4 570
5 2096
6 7784
7 29168
8 110106
9 418128
10 1595616
11 6113740
12 23505352
13 90633796
14 350351636
15 1357278296
16 5268292826
17 20483876816
18 79765662896
19 311038321436
20 1214362277696
21 4746455801876
22 18570960418916