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A172455 as a simple table

na(n)
11
27
384
41463
533936
6990542
734938624
81445713003
968639375616
103676366634402
11219208706540544
1214397191399702118
131032543050697424896
1480280469685284582812
156725557192852592984064
16603931579625379293509683

[1,7,84,1463,33936,990542,34938624,1445713003,
 68639375616,3676366634402,219208706540544,
 14397191399702118,1032543050697424896,
 80280469685284582812,6725557192852592984064,
 603931579625379293509683]