# A251701 (b-file synthesized from sequence entry)
0 1
1 4
2 13
3 36
4 97
5 268
6 765
7 2236
8 6625
9 19764
10 59149
11 177268
12 531585
13 1594492
14 4783165
15 14349132
16 43046977
17 129140452
18 387420813
19 1162261828
20 3486784801
21 10460353644
22 31381060093
23 94143179356
24 282429537057
25 847288610068
26 2541865829005
27 7625597485716