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.

A232317 Number of (1+1)X(n+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero.

Table of values

n a(n)
1 2
2 5
3 16
4 52
5 169
6 549
7 1784
8 5797
9 18837
10 61210
11 198899
12 646313
13 2100164
14 6824385
15 22175521
16 72058322
17 234150159
18 760860029
19 2472379204
20 8033880997
21 26105721877
22 84829326570
23 275648943179
24 895708394113
25 2910562681764
26 9457737786265

List of values

[2, 5, 16, 52, 169, 549, 1784, 5797, 18837, 61210, 198899, 646313, 2100164, 6824385, 22175521, 72058322, 234150159, 760860029, 2472379204, 8033880997, 26105721877, 84829326570, 275648943179, 895708394113, 2910562681764, 9457737786265]

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

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