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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.

A356672 a(n) = n! * Sum_{k=0..n} k^(2*(n-k))/k!.

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 253
5 5661
6 188191
7 8983423
8 594848409
9 52174034713
10 5852229698971
11 822684190381131
12 142739480367287893
13 30074750245383836149
14 7575373641076070706423
15 2252600759590927171373431
16 783103569459739402827046321
17 315587346190678252431713684913

List of values

[1, 1, 3, 19, 253, 5661, 188191, 8983423, 594848409, 52174034713, 5852229698971, 822684190381131, 142739480367287893, 30074750245383836149, 7575373641076070706423, 2252600759590927171373431, 783103569459739402827046321, 315587346190678252431713684913]

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

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