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.

A222285 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 4
3 4
4 35
5 83
6 532
7 1427
8 8540
9 23798
10 143594
11 405187
12 2455279
13 6993039
14 42590466
15 121981025
16 745909396
17 2145554406
18 13161790760
19 37983541068
20 233613349710
21 675981684148
22 4166412530876
23 12082238135283
24 74601934076542

List of values

[0, 4, 4, 35, 83, 532, 1427, 8540, 23798, 143594, 405187, 2455279, 6993039, 42590466, 121981025, 745909396, 2145554406, 13161790760, 37983541068, 233613349710, 675981684148, 4166412530876, 12082238135283, 74601934076542]

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

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