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A193480 as a simple table

na(n)
10
22
34
426
5240
64063
7110576
85046694
9390350577
1051445991632
1111496127271424
124348804724288989
132784306483759192151
143019459887601073667024
155548682373331641079067391
1617274304412990968236505863156

[0,2,4,26,240,4063,110576,5046694,390350577,
 51445991632,11496127271424,4348804724288989,
 2784306483759192151,3019459887601073667024,
 5548682373331641079067391,
 17274304412990968236505863156]