# A010556 (b-file synthesized from sequence entry)
0 1
1 8
2 56
3 392
4 2696
5 18536
6 126536
7 863720
8 5873768
9 39942184
10 271009112
11 1838725896
12 12457092504
13 84392312392
14 571140732808
15 3865210690888
16 26138072412040
17 176752645426600
18 1194553221342296
19 8073068110703880
20 54534614510976680