# A177177 (b-file synthesized from sequence entry)
0 1
1 7
2 15
3 81
4 375
5 2113
6 11911
7 71221
8 433343
9 2704049
10 17125871
11 110044549
12 714925975
13 4690166833
14 31020995831
15 206646565637
16 1385159527343
17 9335979423089
18 63232378792703
19 430146956724677
20 2937659194003655