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A230640 as a simple table

n a(n)
1 0
2 4
3 28
4 248
5 129140168
6 68630377364912
7 2088595827392656793085408064780643444068898148936888424953199350296 

[0,4,28,248,129140168,68630377364912,
 20885958273926567930854080647806434440688981489368\
 88424953199350296]

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)