# A371820 (b-file synthesized from sequence entry)
0 1
1 4
2 15
3 55
4 200
5 726
6 2640
7 9636
8 35343
9 130339
10 483395
11 1802901
12 6760781
13 25482643
14 96506229
15 367077447
16 1401772536
17 5372120718
18 20653929804
19 79634421312
20 307826528346
21 1192608522258
22 4629875048634
23 18006340509702
24 70142823370656
25 273633773330844