A221940 - OEIS

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A221940 as a simple table

n	a(n)
1	1
2	489
3	24535
4	1759041
5	119035112
6	8118923949
7	552777330287
8	37650441405451
9	2564181255574899
10	174635497977344862
11	11893675692936218866
12	810026663520753630706
13	55167419097633745309553
14	3757214394165203187203557

[1,489,24535,1759041,119035112,8118923949, 552777330287,37650441405451,2564181255574899, 174635497977344862,11893675692936218866, 810026663520753630706,55167419097633745309553, 3757214394165203187203557]