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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A346720 a(n) is the number of negative Euler permutations of order 2*n. Bisection (even indices) of A347602.

Table of values

n a(n)
0 0
1 1
2 2
3 163
4 6724
5 692741
6 86756038
7 16135231015
8 3838836369800
9 1178853270354697
10 447322130002332298
11 206783054242756958891
12 114117348385587556703692
13 74183362210489714472590093
14 56080450787901009525514063694
15 48790757690364513377740990959151
16 48400123863374755985614486072403728

List of values

[0, 1, 2, 163, 6724, 692741, 86756038, 16135231015, 3838836369800, 1178853270354697, 447322130002332298, 206783054242756958891, 114117348385587556703692, 74183362210489714472590093, 56080450787901009525514063694, 48790757690364513377740990959151, 48400123863374755985614486072403728]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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