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.

A200834 Number of 0..4 arrays x(0..n+1) of n+2 elements without any two consecutive increases or two consecutive decreases.

Table of values

n a(n)
1 105
2 435
3 1817
4 7587
5 31677
6 132263
7 552247
8 2305835
9 9627715
10 40199277
11 167846875
12 700822891
13 2926195229
14 12217949255
15 51014464969
16 213004292437
17 889371840403
18 3713456951747
19 15505058633553
20 64739364520389

List of values

[105, 435, 1817, 7587, 31677, 132263, 552247, 2305835, 9627715, 40199277, 167846875, 700822891, 2926195229, 12217949255, 51014464969, 213004292437, 889371840403, 3713456951747, 15505058633553, 64739364520389]

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

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