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.

A200190 Number of -6..6 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 12
3 66
4 426
5 2794
6 18838
7 127800
8 881008
9 6081086
10 42452472
11 296258332
12 2085263400
13 14662923954
14 103810065802
15 734016517080
16 5219300699654
17 37060739113354
18 264413563521598
19 1883784631395118
20 13476226807283384

List of values

[1, 12, 66, 426, 2794, 18838, 127800, 881008, 6081086, 42452472, 296258332, 2085263400, 14662923954, 103810065802, 734016517080, 5219300699654, 37060739113354, 264413563521598, 1883784631395118, 13476226807283384]

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

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