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.

A250273 Number of length n+1 0..4 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero.

Table of values

n a(n)
1 5
2 33
3 89
4 581
5 2909
6 17885
7 107387
8 636197
9 3664311
10 20397261
11 110088763
12 579849133
13 3000181901
14 15332918889
15 77721061539
16 391879647949
17 1969334263587
18 9876322139993
19 49468980310981
20 247600089386801
21 1238741942676679

List of values

[5, 33, 89, 581, 2909, 17885, 107387, 636197, 3664311, 20397261, 110088763, 579849133, 3000181901, 15332918889, 77721061539, 391879647949, 1969334263587, 9876322139993, 49468980310981, 247600089386801, 1238741942676679]

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

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