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.

A268440 Triangle read by rows, T(n,k) = C(2*n,n+k)*Sum_{m=0..k} (-1)^(m+k)*C(n+k,n+m)* Stirling1(n+m,m), for n>=0 and 0<=k<=n.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 8
5 3
6 0
7 90
8 120
9 15
10 0
11 1344
12 3640
13 1680
14 105
15 0
16 25200
17 110880
18 107100
19 25200
20 945
21 0
22 570240
23 3617460
24 5815040
25 2910600
26 415800
27 10395
28 0
29 15135120
30 128576448
31 303963660
32 256736480
33 78828750
34 7567560
35 135135

List of values

[1, 0, 1, 0, 8, 3, 0, 90, 120, 15, 0, 1344, 3640, 1680, 105, 0, 25200, 110880, 107100, 25200, 945, 0, 570240, 3617460, 5815040, 2910600, 415800, 10395, 0, 15135120, 128576448, 303963660, 256736480, 78828750, 7567560, 135135]