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A228982 as a simple table

na(n)
116
2252
33928
456472
5796568
611130176
7155031688
82156604552
929985039328
10416823924560
115793846296768
1280531910410704
131119344588000512
1415558135352381712
15216247191614630888
163005682392732317840

[16,252,3928,56472,796568,11130176,155031688,
 2156604552,29985039328,416823924560,5793846296768,
 80531910410704,1119344588000512,15558135352381712,
 216247191614630888,3005682392732317840]