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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.

A294475 a(n) = (-1)^n * A294359(n) / (n+1)^2.

Table of values

n a(n)
0 1
1 1
2 4
3 34
4 480
5 9806
6 265810
7 9031672
8 369946976
9 17763808796
10 979237588724
11 60980447270606
12 4235264029208444
13 324666123698241278
14 27234289478093347800
15 2481803404797989770784
16 244176750407604670797512
17 25799371668963384500485336
18 2913817630601365750195653270
19 350339454794537924316740555298
20 44680403720910899340653296364594

List of values

[1, 1, 4, 34, 480, 9806, 265810, 9031672, 369946976, 17763808796, 979237588724, 60980447270606, 4235264029208444, 324666123698241278, 27234289478093347800, 2481803404797989770784, 244176750407604670797512, 25799371668963384500485336, 2913817630601365750195653270, 350339454794537924316740555298, 44680403720910899340653296364594]

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

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