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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.

A339001 a(n) = (-1)^n * Sum_{k=0..n} (-n)^k * binomial(n,k) * Catalan(k).

Table of values

n a(n)
0 1
1 0
2 5
3 89
4 2481
5 93274
6 4450645
7 258297570
8 17689681345
9 1397903887808
10 125286890408901
11 12562851683433765
12 1393925069404093105
13 169595051215441936902
14 22454465186157134883285

List of values

[1, 0, 5, 89, 2481, 93274, 4450645, 258297570, 17689681345, 1397903887808, 125286890408901, 12562851683433765, 1393925069404093105, 169595051215441936902, 22454465186157134883285]

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

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