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.

A203830 Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 1125
2 17289
3 270333
4 4238721
5 66490965
6 1043088057
7 16363800045
8 256713156657
9 4027283591877
10 63179519387625
11 991152375416541
12 15549074160922593
13 243931925405440053
14 3826773454026870297
15 60033942027766295757

List of values

[1125, 17289, 270333, 4238721, 66490965, 1043088057, 16363800045, 256713156657, 4027283591877, 63179519387625, 991152375416541, 15549074160922593, 243931925405440053, 3826773454026870297, 60033942027766295757]

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

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