# A064416 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 11
4 26
5 59
6 137
7 312
8 719
9 1651
10 3816
11 8757
12 20202
13 46440
14 106957
15 245989
16 566561
17 1303968
18 3002247
19 6910122
20 15909143