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A107875 as a simple table

na(n)
01
15
228
3220
42380
533649
6593775
712620256
8314457495
98996462475
10290752384208
1110477677064400
12416579843773639
1318114175790089400
14855130180330364620
1543553532185070076800
162380434572658017204175

[1,5,28,220,2380,33649,593775,12620256,314457495,
 8996462475,290752384208,10477677064400,
 416579843773639,18114175790089400,
 855130180330364620,43553532185070076800,
 2380434572658017204175]