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.

A383149 Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = (-1)^k * [m^k] (1/2^(m-n)) * Sum_{k=0..m} k^n * (-1)^m * 3^(m-k) * binomial(m,k).

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 3
5 1
6 0
7 12
8 9
9 1
10 0
11 66
12 75
13 18
14 1
15 0
16 480
17 690
18 255
19 30
20 1
21 0
22 4368
23 7290
24 3555
25 645
26 45
27 1
28 0
29 47712
30 88536
31 52290
32 12705
33 1365
34 63
35 1
36 0
37 608016
38 1223628
39 831684
40 249585
41 36120
42 2562
43 84
44 1
45 0
46 8855040
47 19019664
48 14405580
49 5073012
50 915705
51 87696
52 4410
53 108
54 1

List of values

[1, 0, 1, 0, 3, 1, 0, 12, 9, 1, 0, 66, 75, 18, 1, 0, 480, 690, 255, 30, 1, 0, 4368, 7290, 3555, 645, 45, 1, 0, 47712, 88536, 52290, 12705, 1365, 63, 1, 0, 608016, 1223628, 831684, 249585, 36120, 2562, 84, 1, 0, 8855040, 19019664, 14405580, 5073012, 915705, 87696, 4410, 108, 1]