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A275557 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 38
5 315
6 3932
7 58828
8 1049108
9 21523445
10 500010024
11 12968712306
12 371504436220
13 11649042561247
14 396857394156656
15 14596463012746392
16 576460752571867208
17 24330595937833434249
18 1092955779880370116836
19 52063675148955620766430
20 2621440000000512000336088

[1,1,2,6,38,315,3932,58828,1049108,21523445,
 500010024,12968712306,371504436220,11649042561247,
 396857394156656,14596463012746392,
 576460752571867208,24330595937833434249,
 1092955779880370116836,52063675148955620766430,
 2621440000000512000336088]

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Last modified May 20 14:08 EDT 2024. Contains 372717 sequences. (Running on oeis4.)