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.

A087186 Q(p)/p where p runs through the primes and Q(k) is the k-th central quadrinomial coefficient (A005190).

Table of values

n a(n)
1 2
2 4
3 31
4 304
5 40044
6 500522
7 86094668
8 1167752848
9 225001039696
10 652498288154820
11 9451735761626880
12 29731605314969017772
13 6529673496702876605072
14 97300805803445759460364
15 21809340225815485957990464
16 74647602337610140872493303186
17 260456466719887195671579173952976

List of values

[2, 4, 31, 304, 40044, 500522, 86094668, 1167752848, 225001039696, 652498288154820, 9451735761626880, 29731605314969017772, 6529673496702876605072, 97300805803445759460364, 21809340225815485957990464, 74647602337610140872493303186, 260456466719887195671579173952976]