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.

A239005 Signed version of the Seidel triangle for the Euler numbers, read by rows.

Table of values

n a(n)
0 1
1 0
2 1
3 -1
4 -1
5 0
6 0
7 -1
8 -2
9 -2
10 5
11 5
12 4
13 2
14 0
15 0
16 5
17 10
18 14
19 16
20 16
21 -61
22 -61
23 -56
24 -46
25 -32
26 -16
27 0
28 0
29 -61
30 -122
31 -178
32 -224
33 -256
34 -272
35 -272
36 1385
37 1385
38 1324
39 1202
40 1024
41 800
42 544
43 272
44 0
45 0
46 1385
47 2770
48 4094
49 5296
50 6320
51 7120
52 7664
53 7936
54 7936

List of values

[1, 0, 1, -1, -1, 0, 0, -1, -2, -2, 5, 5, 4, 2, 0, 0, 5, 10, 14, 16, 16, -61, -61, -56, -46, -32, -16, 0, 0, -61, -122, -178, -224, -256, -272, -272, 1385, 1385, 1324, 1202, 1024, 800, 544, 272, 0, 0, 1385, 2770, 4094, 5296, 6320, 7120, 7664, 7936, 7936]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.