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.

A317800 G.f. A(x) satisfies: Sum_{n>=1} ( A(x) - (-1)^n * A(-x) )^n * (-1)^n / n = 0.

Table of values

n a(n)
1 1
2 1
3 1
4 4
5 10
6 33
7 105
8 354
9 1214
10 4206
11 14846
12 52750
13 189516
14 686745
15 2506913
16 9211226
17 34036230
18 126426446
19 471769950
20 1767460752
21 6645539212
22 25076120890
23 94937019050
24 360268374124
25 1369645176012
26 5226326126048
27 20039843858208
28 76654036799842
29 290534140464144
30 1123489897863753
31 4582416833711249
32 17212665701732282
33 45565498032190230

List of values

[1, 1, 1, 4, 10, 33, 105, 354, 1214, 4206, 14846, 52750, 189516, 686745, 2506913, 9211226, 34036230, 126426446, 471769950, 1767460752, 6645539212, 25076120890, 94937019050, 360268374124, 1369645176012, 5226326126048, 20039843858208, 76654036799842, 290534140464144, 1123489897863753, 4582416833711249, 17212665701732282, 45565498032190230]

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

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