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.

A200188 Number of -4..4 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.

Table of values

n a(n)
1 1
2 8
3 28
4 120
5 506
6 2240
7 9856
8 44562
9 199932
10 914676
11 4152696
12 19143782
13 87622590
14 406118090
15 1869888346
16 8701509206
17 40245967276
18 187867050760
19 872020225984
20 4080661245080
21 18995817588580
22 89071683414448
23 415623180115020

List of values

[1, 8, 28, 120, 506, 2240, 9856, 44562, 199932, 914676, 4152696, 19143782, 87622590, 406118090, 1869888346, 8701509206, 40245967276, 187867050760, 872020225984, 4080661245080, 18995817588580, 89071683414448, 415623180115020]

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

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