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.

A268430 Number of North-East paths from (0,0) to (n,n) that have even number of times bounce off y = x to the right.

Table of values

n a(n)
0 1
1 2
2 5
3 16
4 53
5 184
6 654
7 2368
8 8689
9 32216
10 120434
11 453248
12 1715266
13 6521584
14 24894364
15 95353472
16 366324729
17 1411015064
18 5447548682
19 21074836864
20 81682204614
21 317110750672
22 1232951721604
23 4800353915264
24 18712880651802
25 73030245143792
26 285311648317172

List of values

[1, 2, 5, 16, 53, 184, 654, 2368, 8689, 32216, 120434, 453248, 1715266, 6521584, 24894364, 95353472, 366324729, 1411015064, 5447548682, 21074836864, 81682204614, 317110750672, 1232951721604, 4800353915264, 18712880651802, 73030245143792, 285311648317172]

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

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