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.

A380612 a(n) = (-1)^n*Product_{k=1..n} (2*k + 1)*(2*k - 3).

Table of values

n a(n)
0 1
1 3
2 -15
3 315
4 -14175
5 1091475
6 -127702575
7 21070924875
8 -4656674397375
9 1327152203251875
10 -473793336560919375
11 207047688077121766875
12 -108700036240488927609375
13 67502722505343624045421875
14 -48939473816374127432930859375
15 40962339584305144661363129296875

List of values

[1, 3, -15, 315, -14175, 1091475, -127702575, 21070924875, -4656674397375, 1327152203251875, -473793336560919375, 207047688077121766875, -108700036240488927609375, 67502722505343624045421875, -48939473816374127432930859375, 40962339584305144661363129296875]