# A026993 (b-file synthesized from sequence entry)
2 1
3 6
4 32
5 180
6 984
7 4606
8 22689
9 114992
10 567129
11 2576582
12 12586319
13 63131004
14 305635176
15 1384074886
16 6739962365
17 33708050180
18 162468169385
19 737652413014
20 3588021213950
21 17917172173846
22 86273708463456
23 393163075111278
24 1911781914938634
25 9536792007640980
26 45924386118166540