# A003162 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 6
5 19
6 49
7 163
8 472
9 1626
10 5034
11 17769
12 57474
13 206487
14 688881
15 2508195
16 8563020
17 31504240
18 109492960
19 406214878
20 1432030036
21 5349255726
22 19077934506
23 71672186953
24 258095737156
25 974311431094
26 3537275250214
27 13408623649893