# A002907 (b-file synthesized from sequence entry)
0 2
1 2
2 20
3 38
4 146
5 368
6 1070
7 2824
8 7680
9 19996
10 53024
11 136350
12 355254
13 906254
14 2331416
15 5909810
16 15067236
17 37992680
18 96210436
19 241564514
20 608469654
21 1522388638
22 3818281784
23 9525139886
24 23806217352
25 59237754234
26 147621207142
27 366533832540
28 911151508282