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A223438 as a simple table

na(n)
13888
2217600
316693920
41485628224
5142702806112
614233389951648
71445484467129440
8148051853028192512
915224711042202343552
101568546471897589578240
11161743493137179916579328

[3888,217600,16693920,1485628224,142702806112,
 14233389951648,1445484467129440,
 148051853028192512,15224711042202343552,
 1568546471897589578240,161743493137179916579328]