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A104991 as a simple table

na(n)
01
14
222
3142
41048
58704
680386
7817786
89093340
9109794556
101431360958
1120047830262
12300343272952
134793871035416
1481232799446906
151456671526257106
1627562347560513524
17548844246683051860
1811474015910364016086

[1,4,22,142,1048,8704,80386,817786,9093340,
 109794556,1431360958,20047830262,300343272952,
 4793871035416,81232799446906,1456671526257106,
 27562347560513524,548844246683051860,
 11474015910364016086]