# A047772 (b-file synthesized from sequence entry)
1 0
2 0
3 1
4 8
5 42
6 232
7 1277
8 7183
9 41041
10 238315
11 1402076
12 8343804
13 50136483
14 303790544
15 1854115285
16 11388104153
17 70338364135
18 436605050440
19 2722153369473
20 17040017600925
21 107052073186950
22 674752469797923
23 4265733944934540