cp's OEIS Frontend

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.

A331657 a(n) = Sum_{k=0..n} (-1)^(n - k) * binomial(n,k) * binomial(n+k,k) * n^k.

Table of values

n a(n)
0 1
1 1
2 13
3 305
4 10321
5 458649
6 25289461
7 1666406209
8 127779121345
9 11178899075537
10 1098961472475901
11 119937806278590321
12 14389588419704763409
13 1882432013890951832425
14 266678501426944160023653
15 40673387011956179149166849
16 6644919093900517186643470081

List of values

[1, 1, 13, 305, 10321, 458649, 25289461, 1666406209, 127779121345, 11178899075537, 1098961472475901, 119937806278590321, 14389588419704763409, 1882432013890951832425, 266678501426944160023653, 40673387011956179149166849, 6644919093900517186643470081]

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

Content is available under The OEIS End-User License Agreement.