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.

A222284 Number of nX2 0..1 arrays with exactly floor(nX2/2) 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 0
3 4
4 11
5 8
6 44
7 144
8 352
9 692
10 2488
11 6476
12 17095
13 43308
14 131488
15 340000
16 939959
17 2520616
18 7194232
19 19142160
20 53471296
21 145636612
22 407743540
23 1107902624
24 3092203004
25 8488056840
26 23644607144
27 64986279340
28 181063135999
29 499746197884

List of values

[0, 0, 4, 11, 8, 44, 144, 352, 692, 2488, 6476, 17095, 43308, 131488, 340000, 939959, 2520616, 7194232, 19142160, 53471296, 145636612, 407743540, 1107902624, 3092203004, 8488056840, 23644607144, 64986279340, 181063135999, 499746197884]

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

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