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.

A247490 Square array read by antidiagonals: A(k, n) = (-1)^(n+1)* hypergeom([k, -n+1], [], 1) for n>0 and A(k,0) = 0 (n>=0, k>=1).

Table of values

n a(n)
0 0
1 0
2 1
3 0
4 1
5 0
6 0
7 1
8 1
9 1
10 0
11 1
12 2
13 3
14 2
15 0
16 1
17 3
18 7
19 11
20 9
21 0
22 1
23 4
24 13
25 32
26 53
27 44
28 0
29 1
30 5
31 21
32 71
33 181
34 309
35 265
36 0
37 1
38 6
39 31
40 134
41 465
42 1214
43 2119
44 1854
45 0
46 1
47 7
48 43
49 227
50 1001
51 3539
52 9403
53 16687
54 14833
55 0
56 1
57 8
58 57
59 356
60 1909
61 8544
62 30637
63 82508
64 148329
65 133496

List of values

[0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 2, 3, 2, 0, 1, 3, 7, 11, 9, 0, 1, 4, 13, 32, 53, 44, 0, 1, 5, 21, 71, 181, 309, 265, 0, 1, 6, 31, 134, 465, 1214, 2119, 1854, 0, 1, 7, 43, 227, 1001, 3539, 9403, 16687, 14833, 0, 1, 8, 57, 356, 1909, 8544, 30637, 82508, 148329, 133496]