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A277391 as a simple table

na(n)
01
13
234
3654
417688
5616120
626252496
71322624016
876909665664
95069558461824
10373529452588800
1130422117430022912
122713911389090970624
13263171888496899625984
1427563036166079327578112
153100736138961250867968000
16372888702864658105915244544

[1,3,34,654,17688,616120,26252496,1322624016,
 76909665664,5069558461824,373529452588800,
 30422117430022912,2713911389090970624,
 263171888496899625984,27563036166079327578112,
 3100736138961250867968000,
 372888702864658105915244544]