A281768 - cp's OEIS frontend

A281768 Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

n	a(n)
1	0
2	20
3	90
4	560
5	2808
6	13968
7	68362
8	323280
9	1529974
10	7114300
11	32915192
12	151142772
13	689726508
14	3133687480
15	14169310798
16	63838844556
17	286639424578
18	1283124275056
19	5728711606322
20	25513799290264
21	113382456085042
22	502859346935932

[0, 20, 90, 560, 2808, 13968, 68362, 323280, 1529974, 7114300, 32915192, 151142772, 689726508, 3133687480, 14169310798, 63838844556, 286639424578, 1283124275056, 5728711606322, 25513799290264, 113382456085042, 502859346935932]

cp's OEIS Frontend

A281768 Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Table of values

List of values