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A168897 as a simple table

na(n)
01
128
2756
320412
4551124
514880348
6401769396
710847773692
8292889889684
97908027021468
10213516729579636
115764951698650172
12155653695863554644
134202649788315975388
14113471544284531335476
153063731695682346057852

[1,28,756,20412,551124,14880348,401769396,
 10847773692,292889889684,7908027021468,
 213516729579636,5764951698650172,
 155653695863554644,4202649788315975388,
 113471544284531335476,3063731695682346057852]