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A323570 as a simple table

na(n)
01
15
290
32782
4120746
56745934
6460888652
737224433556
83469644818024
9366563797094652
1043286560860984450
115649978863795503006
12807731962396091271434
13125520224606849421561430
1421066610381145458077037434
153797680233697346232224683014
16731834222599438183659030765632
17150129114941670825877326504381416
1832664492662327616894474980982618994
197513192417898597095586779634504947174
201821542500014252695637241514145496199576

[1,5,90,2782,120746,6745934,460888652,37224433556,
 3469644818024,366563797094652,43286560860984450,
 5649978863795503006,807731962396091271434,
 125520224606849421561430,
 21066610381145458077037434,
 3797680233697346232224683014,
 731834222599438183659030765632,
 150129114941670825877326504381416,
 32664492662327616894474980982618994,
 7513192417898597095586779634504947174,
 1821542500014252695637241514145496199576]