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A367080 as a simple table

na(n)
01
11
25
350
4766
515914
6418548
713337624
8499600848
921516318360
101047593782440
1156903921842272
123411723783002016
13223803339516120480
1415944855840879771232
151226078375934824887680
16101209861891840507123200
178926972851724904613537792

[1,1,5,50,766,15914,418548,13337624,499600848,
 21516318360,1047593782440,56903921842272,
 3411723783002016,223803339516120480,
 15944855840879771232,1226078375934824887680,
 101209861891840507123200,
 8926972851724904613537792]