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.

A334549 Array read by antidiagonals: T(n,k) is the number of {-1,0,1} n X k matrices with all rows and columns summing to zero.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 3
13 1
14 1
15 1
16 1
17 7
18 7
19 1
20 1
21 1
22 1
23 19
24 31
25 19
26 1
27 1
28 1
29 1
30 51
31 175
32 175
33 51
34 1
35 1
36 1
37 1
38 141
39 991
40 2371
41 991
42 141
43 1
44 1
45 1
46 1
47 393
48 5881
49 32611
50 32611
51 5881
52 393
53 1
54 1
55 1
56 1
57 1107
58 35617
59 481381
60 1084851
61 481381
62 35617
63 1107
64 1
65 1

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 7, 7, 1, 1, 1, 1, 19, 31, 19, 1, 1, 1, 1, 51, 175, 175, 51, 1, 1, 1, 1, 141, 991, 2371, 991, 141, 1, 1, 1, 1, 393, 5881, 32611, 32611, 5881, 393, 1, 1, 1, 1, 1107, 35617, 481381, 1084851, 481381, 35617, 1107, 1, 1]