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A371406 as a simple table

na(n)
01
16
249
3462
44734
551216
6575705
76657846
878703438
9946740132
1011551512042
11142616584380
121778372098000
1322365031140900
14283341912929865
153612782260978470
1646326552943960278
17597034029166804068
187728885814331709374
19100458438481544424996

[1,6,49,462,4734,51216,575705,6657846,78703438,
 946740132,11551512042,142616584380,1778372098000,
 22365031140900,283341912929865,3612782260978470,
 46326552943960278,597034029166804068,
 7728885814331709374,100458438481544424996]