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A222671 as a simple table

na(n)
18
280
31336
420606
5426362
69334575
7244592240
86696876400
9189469189930
105486076619642
11160969581159830
124753772105875149
13140756030057698872
144174584083484598931
15123964025120779460314
163684029351402136756157

[8,80,1336,20606,426362,9334575,244592240,
 6696876400,189469189930,5486076619642,
 160969581159830,4753772105875149,
 140756030057698872,4174584083484598931,
 123964025120779460314,3684029351402136756157]