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.

A232318 Number of (2+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 5
2 24
3 139
4 853
5 5241
6 32089
7 196698
8 1205422
9 7387476
10 45274221
11 277463582
12 1700438900
13 10421159854
14 63866201729
15 391404773682
16 2398728792093
17 14700637816523
18 90093032996396
19 552136219923131
20 3383773364176424

List of values

[5, 24, 139, 853, 5241, 32089, 196698, 1205422, 7387476, 45274221, 277463582, 1700438900, 10421159854, 63866201729, 391404773682, 2398728792093, 14700637816523, 90093032996396, 552136219923131, 3383773364176424]

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

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