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A121835 as a simple table

na(n)
01
11
26
3540
41360800
5154314720000
61154953090368000000
7786615912769073587200000000
864289841661815089567953305600000000000
9803921077736369993656026249310037606400000000000000

[1,1,6,540,1360800,154314720000,
 1154953090368000000,786615912769073587200000000,
 64289841661815089567953305600000000000,
 80392107773636999365602624931003760640000000000000\
 0]