# A007999 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 2
5 3
6 8
7 19
8 64
9 213
10 880
11 3717
12 18288
13 92935
14 531440
15 3147495
16 20525168
17 138638825
18 1015694832
19 7700244745
20 62623847536
21 526317901451
22 4705365925872
23 43407723925499
24 423149546210416
25 4250149857500861
26 44868038386273776
27 487341646372204813