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.

A209521 Number of nX2 0..7 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..7 introduced in row major order.

Table of values

n a(n)
1 2
2 6
3 57
4 700
5 10677
6 193676
7 4054358
8 95534880
9 2472405340
10 68613576496
11 1999809519672
12 60231323048000
13 1853103730499696
14 57790053276242496
15 1817609007303894496
16 57472115932658904064
17 1823283879810883824576

List of values

[2, 6, 57, 700, 10677, 193676, 4054358, 95534880, 2472405340, 68613576496, 1999809519672, 60231323048000, 1853103730499696, 57790053276242496, 1817609007303894496, 57472115932658904064, 1823283879810883824576]

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

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