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A121676 as a simple table

na(n)
01
12
26
332
4250
52412
627524
7360600
85296050
985805420
101515794467
1128926900312
12591903009295
1312907255696636
14298428274844730
157284351640977920
16187013495992710210
175033669346061547724
18141643700005223732471

[1,2,6,32,250,2412,27524,360600,5296050,85805420,
 1515794467,28926900312,591903009295,
 12907255696636,298428274844730,7284351640977920,
 187013495992710210,5033669346061547724,
 141643700005223732471]