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A229238 as a simple table

na(n)
12
24
316
418
564
6100
7450
81458
94096
104624
1128900
1236450
1362500
1465536
15130050
16262144
17281250
181062882
191336336
203334800
217064400
228352100
2310156800
2410534050
2518062500
2621193200
2722781250
2826572050
2937584450
3039062500
3148944016
3281281250
33124411716

[2,4,16,18,64,100,450,1458,4096,4624,28900,36450,
 62500,65536,130050,262144,281250,1062882,1336336,
 3334800,7064400,8352100,10156800,10534050,
 18062500,21193200,22781250,26572050,37584450,
 39062500,48944016,81281250,124411716]