A222568 - cp's OEIS frontend

A222568 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

n	a(n)
1	1
2	5
3	11
4	120
5	500
6	5210
7	20889
8	229894
9	913405
10	10427244
11	40896923
12	479942958
13	1866795781
14	22316526370
15	86377362833
16	1045093746614
17	4036724271985
18	49216523120074
19	190041618262033
20	2328483132653366
21	8997015510376997

[1, 5, 11, 120, 500, 5210, 20889, 229894, 913405, 10427244, 40896923, 479942958, 1866795781, 22316526370, 86377362833, 1045093746614, 4036724271985, 49216523120074, 190041618262033, 2328483132653366, 8997015510376997]

cp's OEIS Frontend

A222568 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

Table of values

List of values