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A084861 as a simple table

na(n)
01
11
24
39
421
548
6108
7240
8528
91152
102496
115376
1211520
1324576
1452224
15110592
16233472
17491520
181032192
192162688
204521984
219437184
2219660800
2340894464
2484934656
25176160768
26364904448
27754974720
281560281088
293221225472

[1,1,4,9,21,48,108,240,528,1152,2496,5376,11520,
 24576,52224,110592,233472,491520,1032192,2162688,
 4521984,9437184,19660800,40894464,84934656,
 176160768,364904448,754974720,1560281088,
 3221225472]