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.

A203829 Number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 225
2 1971
3 17289
4 151659
5 1330353
6 11669859
7 102368025
8 897972507
9 7877016513
10 69097203603
11 606120799401
12 5316892787403
13 46639793487825
14 409124355815619
15 3588839615364921
16 31481307826653051
17 276154091209147617

List of values

[225, 1971, 17289, 151659, 1330353, 11669859, 102368025, 897972507, 7877016513, 69097203603, 606120799401, 5316892787403, 46639793487825, 409124355815619, 3588839615364921, 31481307826653051, 276154091209147617]

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

Content is available under The OEIS End-User License Agreement.