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A252740 as a simple table

na(n)
01
12
26
3180
41134000
53465651420000000
6356414438712215830124178000000000000000
71311750338118625705168608107387873609070899443110750355586669940000000000000000000000000000000

[1,2,6,180,1134000,3465651420000000,
 356414438712215830124178000000000000000,
 13117503381186257051686081073878736090708994431107\
 50355586669940000000000000000000000000000000]