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A064618 as a simple table

na(n)
01
11
25
349
4821
521121
6775205
738516689
82490976661
9203419086241
1020474978755205
112490729330118129
12360263844701062901
1361114158974786823361
1412017074366801186956005
152711409826920884006692369
16695820350706240448128979541
17201526362605605903609254528481

[1,1,5,49,821,21121,775205,38516689,2490976661,
 203419086241,20474978755205,2490729330118129,
 360263844701062901,61114158974786823361,
 12017074366801186956005,2711409826920884006692369,
 695820350706240448128979541,
 201526362605605903609254528481]