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.

A034261 Infinite square array f(a,b) = C(a+b,b+1)*(a*b+a+1)/(b+2), a, b >= 0, read by antidiagonals. Equivalently, triangular array T(n,k) = f(k,n-k), 0 <= k <= n, read by rows.

Table of values

n a(n)
0 0
1 0
2 1
3 0
4 1
5 3
6 0
7 1
8 5
9 6
10 0
11 1
12 7
13 14
14 10
15 0
16 1
17 9
18 25
19 30
20 15
21 0
22 1
23 11
24 39
25 65
26 55
27 21
28 0
29 1
30 13
31 56
32 119
33 140
34 91
35 28
36 0
37 1
38 15
39 76
40 196
41 294
42 266
43 140
44 36
45 0
46 1
47 17
48 99
49 300
50 546
51 630
52 462
53 204
54 45
55 0
56 1
57 19
58 125
59 435
60 930
61 1302
62 1218
63 750
64 285
65 55

List of values

[0, 0, 1, 0, 1, 3, 0, 1, 5, 6, 0, 1, 7, 14, 10, 0, 1, 9, 25, 30, 15, 0, 1, 11, 39, 65, 55, 21, 0, 1, 13, 56, 119, 140, 91, 28, 0, 1, 15, 76, 196, 294, 266, 140, 36, 0, 1, 17, 99, 300, 546, 630, 462, 204, 45, 0, 1, 19, 125, 435, 930, 1302, 1218, 750, 285, 55]