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A003756 as a simple table

na(n)
11
20
324
454
5492
61944
711976
857024
9313440
101587168
118417472
1243483392
13227995008
141185394176
156192642048
1632263570944
17168350991360
18877689686016
194578049517568
2023872537976832
21124504626978816
22649282059657216
233386128302882816
2417658788068196352

[1,0,24,54,492,1944,11976,57024,313440,1587168,
 8417472,43483392,227995008,1185394176,6192642048,
 32263570944,168350991360,877689686016,
 4578049517568,23872537976832,124504626978816,
 649282059657216,3386128302882816,
 17658788068196352]