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A001315 as a simple table

na(n)
02
14
28
320
4100
52116
61114244
768723671300
81180735735906024030724
9170141183460507917357914971986913657860

[2,4,8,20,100,2116,1114244,68723671300,
 1180735735906024030724,
 170141183460507917357914971986913657860]