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A277406 as a simple table

na(n)
01
12
29
376
41100
525176
6846132
739321696
82413753344
9189030205440
1018383301319680
112172771551093760
12306662748175330560
1350933260598106862080
149832247390118248121600
152182733403365330313523200
16552134185815355910465126400
17157863713952139655599757721600
1850654908373638564216229105664000

[1,2,9,76,1100,25176,846132,39321696,2413753344,
 189030205440,18383301319680,2172771551093760,
 306662748175330560,50933260598106862080,
 9832247390118248121600,2182733403365330313523200,
 552134185815355910465126400,
 157863713952139655599757721600,
 50654908373638564216229105664000]