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A303212 as a simple table

na(n)
10
21
36
496
5600
62400
77350
818816
942336
1086400
11163350
12290400
13490776
14794976
151242150
161881600
172774400
183995136
195633766
207797600
2110613400
2214229600
2318818646
2424579456
2531740000
2640560000
2751333750
2864393056
2980110296
3098901600

[0,1,6,96,600,2400,7350,18816,42336,86400,163350,
 290400,490776,794976,1242150,1881600,2774400,
 3995136,5633766,7797600,10613400,14229600,
 18818646,24579456,31740000,40560000,51333750,
 64393056,80110296,98901600]