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A167481 as a simple table

na(n)
01
10
26
38
454
5144
6636
72160
88550
931520
10121716
11462000
121780156
136840288
1426436024
15102245472
16396589446
171540427328
185994280644
1923356702512
2091133123796
21355991626848
221392115710024
235449199307552
2421349205067996

[1,0,6,8,54,144,636,2160,8550,31520,121716,462000,
 1780156,6840288,26436024,102245472,396589446,
 1540427328,5994280644,23356702512,91133123796,
 355991626848,1392115710024,5449199307552,
 21349205067996]