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A059421 as a simple table

na(n)
116
2136
3616
42016
55376
612432
725872
849632
989232
10152152
11248248
12390208
13594048
14879648
151271328
161798464
172496144
183405864
194576264
206063904
217934080
2210261680
2313132080
2416642080
2520900880
2626031096
2732169816
2839469696

[16,136,616,2016,5376,12432,25872,49632,89232,
 152152,248248,390208,594048,879648,1271328,
 1798464,2496144,3405864,4576264,6063904,7934080,
 10261680,13132080,16642080,20900880,26031096,
 32169816,39469696]