# A216494 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 12
4 55
5 274
6 1444
7 7923
8 44803
9 259326
10 1529034
11 9151733
12 55459124
13 339595673
14 2097962269
15 13060078469
16 81842038111
17 515867610612
18 3268440469234
19 20803681980270
20 132963257157430
21 852981624781996
22 5490522454007139
23 35450567948693263
24 229537971398979212
25 1490074420399924169
26 9696064337840077823