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A004988 as a simple table

na(n)
01
16
245
3360
42970
524948
6212058
71817640
815677145
9135868590
101182056733
1110316131488
1290266150520
13791564704560
146954461332920
1561199259729696
16539318476367946
174758692438540700
1842035116540442850
19371678925199705200
203289358488017391020

[1,6,45,360,2970,24948,212058,1817640,15677145,
 135868590,1182056733,10316131488,90266150520,
 791564704560,6954461332920,61199259729696,
 539318476367946,4758692438540700,
 42035116540442850,371678925199705200,
 3289358488017391020]