# A148997 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 121
6 468
7 1859
8 7558
9 31270
10 131330
11 558115
12 2396603
13 10379648
14 45292679
15 198926208
16 878692550
17 3900981744
18 17396764823
19 77896353911
20 350065380105
21 1578398595372
22 7138256186788
23 32371596240950
24 147175354377729
25 670685606484390
26 3062947647863016
27 14016157023522647