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A083589 as a simple table

na(n)
01
14
216
364
4257
51028
64112
716448
865793
9263172
101052688
114210752
1216843009
1367372036
14269488144
151077952576
164311810305
1717247241220
1868988964880
19275955859520
201103823438081
214415293752324
2217661175009296
2370644700037184

[1,4,16,64,257,1028,4112,16448,65793,263172,
 1052688,4210752,16843009,67372036,269488144,
 1077952576,4311810305,17247241220,68988964880,
 275955859520,1103823438081,4415293752324,
 17661175009296,70644700037184]