# A149953 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 15
4 51
5 183
6 690
7 2680
8 10664
9 43361
10 179166
11 750618
12 3182815
13 13627850
14 58858838
15 256136007
16 1121888880
17 4942820194
18 21890082385
19 97392793659
20 435140490144
21 1951512891396
22 8782251791612
23 39646601500866
24 179495259553219
25 814795429411189
26 3707690621124339
27 16909746064544733