# A216969 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 5
5 17
6 51
7 199
8 653
9 2746
10 9506
11 41887
12 150209
13 683534
14 2513812
15 11714529
16 43913589
17 208460660
18 793362271
19 3822998161
20 14731492719
21 71883765642
22 279923388563
23 1380780426067
24 5426284435421
25 27023956574169
26 107069182011993
27 537876237669664