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A256605 as a simple table

na(n)
23
34
420
512
684
7120
8360
9360
103960
112520
1232760
1327720
1427720
1555440
16942480
17720720
1813693680
1912252240
2012252240
2112252240
22281801520
23232792560
241163962800
251163962800
263491888400
273491888400
28101264763600
2980313433200
302489716429200
314658179125600

[3,4,20,12,84,120,360,360,3960,2520,32760,27720,
 27720,55440,942480,720720,13693680,12252240,
 12252240,12252240,281801520,232792560,1163962800,
 1163962800,3491888400,3491888400,101264763600,
 80313433200,2489716429200,4658179125600]