# A006757 (b-file synthesized from sequence entry)
0 0
1 8
2 10
3 11
4 12
5 16
6 32
7 54
8 97
9 183
10 334
11 636
12 1218
13 2339
14 4495
15 8807
16 17280
17 33924
18 66630
19 130921
20 259503