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A028680 as a simple table

n a(n)
0 1
1 306
2 32023512
3 1089004102288704
4 12000667955029147591142400
5 42847968954950283704312619696092774400
6 49567873660106321460531697392097352394556112948428800

[1,306,32023512,1089004102288704,
 12000667955029147591142400,
 42847968954950283704312619696092774400,
 49567873660106321460531697392097352394556112948428\
 800]

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Last modified February 22 14:47 EST 2024. Contains 370256 sequences. (Running on oeis4.)