# A006425 (b-file synthesized from sequence entry)
1 4
2 79
3 900
4 7885
5 59080
6 398846
7 2499096
8 14805705
9 83969600
10 459868530
11 2447439384
12 12718070274
13 64766697520
14 324156347260
15 1598200903280
16 7776728909121
17 37404399901296
18 178060831286890
19 839857764202520
20 3928581810398630
21 18239060530882224
22 84101317494787684