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.

A197247 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,0,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 3
2 40
3 110
4 780
5 5062
6 31276
7 213912
8 1244680
9 8149652
10 54813300
11 363207297
12 2334210952
13 15099425049
14 99496688244
15 657733281792
16 4291822021778
17 27959094118746
18 183056501656614
19 1201021999376817
20 7872982494463940

List of values

[3, 40, 110, 780, 5062, 31276, 213912, 1244680, 8149652, 54813300, 363207297, 2334210952, 15099425049, 99496688244, 657733281792, 4291822021778, 27959094118746, 183056501656614, 1201021999376817, 7872982494463940]

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

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