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.

A187421 Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.

Table of values

n a(n)
1 609
2 6512
3 46764
4 602024
5 5254072
6 56472058
7 533853394
8 5585054046
9 54998694426
10 562340568708
11 5598043072500
12 56738877828678
13 568753193822092
14 5743694780294918
15 57708886492197048
16 581740972471740850

List of values

[609, 6512, 46764, 602024, 5254072, 56472058, 533853394, 5585054046, 54998694426, 562340568708, 5598043072500, 56738877828678, 568753193822092, 5743694780294918, 57708886492197048, 581740972471740850]

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

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