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A165980 as a simple table

na(n)
01
128
2756
320412
4551124
514880348
6401769396
710847773692
8292889889684
97908027021468
10213516729579258
115764951698629760
12155653695862728336
134202649788286235104
14113471544283527738672
153063731695649832497472

[1,28,756,20412,551124,14880348,401769396,
 10847773692,292889889684,7908027021468,
 213516729579258,5764951698629760,
 155653695862728336,4202649788286235104,
 113471544283527738672,3063731695649832497472]