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.

A361938 a(0)=1, a(1)=0; a(n) = floor(n/2)*(a(n-1) + a(n-2)).

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 4
5 10
6 42
7 156
8 792
9 3792
10 22920
11 133560
12 938880
13 6434640
14 51614640
15 406344960
16 3663676800
17 32560174080
18 326014657920
19 3227173488000
20 35531881459200
21 387590549472000
22 4654346740243200
23 55461310186867200
24 721387883125324800
25 9322190319746304000

List of values

[1, 0, 1, 1, 4, 10, 42, 156, 792, 3792, 22920, 133560, 938880, 6434640, 51614640, 406344960, 3663676800, 32560174080, 326014657920, 3227173488000, 35531881459200, 387590549472000, 4654346740243200, 55461310186867200, 721387883125324800, 9322190319746304000]