# A049161 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 3
5 15
6 57
7 169
8 443
9 1211
10 3855
11 13495
12 46749
13 154397
14 496203
15 1611499
16 5395893
17 18473853
18 63472005
19 216711453
20 737070887
21 2515433411
22 8649866677
23 29935649141
24 103896813439
25 360791085751
26 1253684914707
27 4364603935363