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.

A301945 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 2
3 20
4 947
5 120815
6 58609226
7 86143630040
8 418568449327270
9 6527100767589040926
10 331808147283786972146018
11 54543586667142977292165721500
12 29084806316831133817614992597097070

List of values

[0, 2, 20, 947, 120815, 58609226, 86143630040, 418568449327270, 6527100767589040926, 331808147283786972146018, 54543586667142977292165721500, 29084806316831133817614992597097070]

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

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