# A381940 (b-file synthesized from sequence entry)
0 1
1 2
2 7
3 51
4 440
5 4170
6 41921
7 438972
8 4736281
9 52286520
10 587774685
11 6705201456
12 77426676892
13 903251324476
14 10629495065550
15 126032922655030
16 1504194199010435
17 18056321542477095
18 217859030049153565
19 2640609137351540510
20 32137554969392230950
21 392580762083089376630