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A326517 as a simple table

na(n)
01
11
22
312
428
5140
6956
73520
817792
9111600
101144400
114884064
1234907936
13214869920
141881044032
1525687617152
16139175009920
171098825972608
188770328141888
1974286112885504
20784394159958848
2115114871659653952
2292392468773724544
23889380453354852416
247652770202041529856

[1,1,2,12,28,140,956,3520,17792,111600,1144400,
 4884064,34907936,214869920,1881044032,25687617152,
 139175009920,1098825972608,8770328141888,
 74286112885504,784394159958848,15114871659653952,
 92392468773724544,889380453354852416,
 7652770202041529856]