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.

A221246 Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor.

Table of values

n a(n)
1 0
2 9
3 50
4 484
5 3864
6 32400
7 267264
8 2214144
9 18316800
10 151585344
11 1254325824
12 10379534400
13 85889605824
14 710729930304
15 5881230244800
16 48666696727104
17 402712880117184
18 3332415765326400
19 27575464553486784
20 228184686537228864

List of values

[0, 9, 50, 484, 3864, 32400, 267264, 2214144, 18316800, 151585344, 1254325824, 10379534400, 85889605824, 710729930304, 5881230244800, 48666696727104, 402712880117184, 3332415765326400, 27575464553486784, 228184686537228864]

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

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