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A181685 as a simple table

na(n)
10
236
3432
41296
515552
6139968
7559872
85038848
940310784
10181398528
111451188224
1210883911680
1352242776064
14391820820480
152821109907456
1614105549537280
17101559956668416
18710919696678912
193656158440062976
2025593109080440832
21175495605123022848
22921351926895869952

[0,36,432,1296,15552,139968,559872,5038848,
 40310784,181398528,1451188224,10883911680,
 52242776064,391820820480,2821109907456,
 14105549537280,101559956668416,710919696678912,
 3656158440062976,25593109080440832,
 175495605123022848,921351926895869952]