A222680 - cp's OEIS frontend

A222680 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

n	a(n)
1	2
2	1
3	5
4	10
5	25
6	150
7	359
8	2249
9	6511
10	39991
11	119033
12	747758
13	2254819
14	14115927
15	43486517
16	268330409
17	844434635
18	5129191736
19	16468845241
20	98454511005
21	322307191185
22	1896450581728
23	6325288982445
24	36644084370361
25	124416281370753

[2, 1, 5, 10, 25, 150, 359, 2249, 6511, 39991, 119033, 747758, 2254819, 14115927, 43486517, 268330409, 844434635, 5129191736, 16468845241, 98454511005, 322307191185, 1896450581728, 6325288982445, 36644084370361, 124416281370753]

cp's OEIS Frontend

A222680 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Table of values

List of values