# A135967 (b-file synthesized from sequence entry)
0 1
1 2
2 3
3 6
4 13
5 38
6 141
7 672
8 4081
9 31544
10 310171
11 3879588
12 61725481
13 1249215110
14 32159093791
15 1053086855394
16 43865027507209
17 2324162212695626
18 156642025511922149
19 13429008862711938180
20 1464446313265909756141