# A149222 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 10
4 44
5 142
6 648
7 2346
8 10929
9 41996
10 198400
11 790809
12 3772937
13 15423184
14 74122058
15 308698810
16 1491917931
17 6303461720
18 30598038823
19 130770863783
20 636981609747
21 2748036278509
22 13422579735590
23 58363260029680
24 285708746598083
25 1250618636818368
26 6133514881151521
27 27002871070397109