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A247219 as a simple table

na(n)
12
24
316
436
5256
6456
71296
82556
94356
106480
118008
1211952
1326320
1444100
1547520
1647880
1749680
1857240
1965536
2074448
2184420
2297812
23141156
24157080
25165600
26225456
27278496
28310590
29333432
30365940
31403900
32419710
33476736
34557040
35560736
36576720
37647088
381011960
391033056
401204560
411206180

[2,4,16,36,256,456,1296,2556,4356,6480,8008,11952,
 26320,44100,47520,47880,49680,57240,65536,74448,
 84420,97812,141156,157080,165600,225456,278496,
 310590,333432,365940,403900,419710,476736,557040,
 560736,576720,647088,1011960,1033056,1204560,
 1206180]