# A090576 (b-file synthesized from sequence entry)
0 1
1 4
2 12
3 40
4 128
5 412
6 1251
7 4026
8 12362
9 39624
10 120012
11 379132
12 1130914
13 3530916
14 10402781
15 32112656
16 93427431