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.

A253670 Square array read by ascending antidiagonals, T(n, k) = k!*[x^k](exp(x)*sum(j=0..n, C(2*n,j)*x^j)), n>=0, k>=0.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 3
5 1
6 1
7 5
8 5
9 1
10 1
11 7
12 21
13 7
14 1
15 1
16 9
17 43
18 49
19 9
20 1
21 1
22 11
23 73
24 229
25 89
26 11
27 1
28 1
29 13
30 111
31 529
32 685
33 141
34 13
35 1
36 1
37 15
38 157
39 1021
40 3393
41 1531
42 205
43 15
44 1
45 1
46 17
47 211
48 1753
49 8501
50 12361
51 2887
52 281
53 17
54 1
55 1
56 19
57 273
58 2773
59 18001
60 63591
61 32809
62 4873
63 369
64 19
65 1

List of values

[1, 1, 1, 1, 3, 1, 1, 5, 5, 1, 1, 7, 21, 7, 1, 1, 9, 43, 49, 9, 1, 1, 11, 73, 229, 89, 11, 1, 1, 13, 111, 529, 685, 141, 13, 1, 1, 15, 157, 1021, 3393, 1531, 205, 15, 1, 1, 17, 211, 1753, 8501, 12361, 2887, 281, 17, 1, 1, 19, 273, 2773, 18001, 63591, 32809, 4873, 369, 19, 1]