# A004380 (b-file synthesized from sequence entry)
12 1
13 91
14 4753
15 187460
16 6210820
17 182637273
18 4925156775
19 124397910208
20 2985733783935
21 68805631064170
22 1534076755992935
23 33283806441690896
24 705873715441872264
25 14684612966748995725
26 300515354528763817950