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.

A268437 Triangle read by rows, T(n,k) = (-1)^k*(2*n)!*P[n,k](1/(n+1)) where P is the P-transform, for n>=0 and 0<=k<=n.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 4
5 6
6 0
7 30
8 120
9 90
10 0
11 336
12 2800
13 5040
14 2520
15 0
16 5040
17 80640
18 264600
19 302400
20 113400
21 0
22 95040
23 2827440
24 15190560
25 29937600
26 24948000
27 7484400
28 0
29 2162160
30 118198080
31 983782800
32 2986663680
33 4162158000
34 2724321600
35 681080400

List of values

[1, 0, 1, 0, 4, 6, 0, 30, 120, 90, 0, 336, 2800, 5040, 2520, 0, 5040, 80640, 264600, 302400, 113400, 0, 95040, 2827440, 15190560, 29937600, 24948000, 7484400, 0, 2162160, 118198080, 983782800, 2986663680, 4162158000, 2724321600, 681080400]