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A268010 as a simple table

na(n)
11
22
34
412
540
6154
7656
83074
915616
1085360
11498464
123092450
1320286360
14140153382
151016262080
167710988372
1761062381784
18503482376930
194313580705728
2038328590370762
21352618807559008
223353663977088848
2332927374589861296

[1,2,4,12,40,154,656,3074,15616,85360,498464,
 3092450,20286360,140153382,1016262080,7710988372,
 61062381784,503482376930,4313580705728,
 38328590370762,352618807559008,3353663977088848,
 32927374589861296]