# A261186 (b-file synthesized from sequence entry)
2 4
3 35
4 252
5 1716
6 11440
7 75582
8 497420
9 3268760
10 21474180
11 141120525
12 927983760
13 6107086800
14 40225345056
15 265182149218
16 1749695026860
17 11554258485616
18 76360380541900
19 505037289962205
20 3342649210440540
21 22138745874816900
22 146721427591999680