A268069 - cp's OEIS frontend

A268069 Number of n X 1 0..3 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

n	a(n)
1	1
2	2
3	4
4	12
5	39
6	138
7	499
8	1830
9	6723
10	24714
11	90751
12	332910
13	1219947
14	4466562
15	16340935
16	59746326
17	218334531
18	797537226
19	2912254303
20	10631252766
21	38800597851
22	141582417426
23	516549545527
24	1884336977574
25	6873201390579

[1, 2, 4, 12, 39, 138, 499, 1830, 6723, 24714, 90751, 332910, 1219947, 4466562, 16340935, 59746326, 218334531, 797537226, 2912254303, 10631252766, 38800597851, 141582417426, 516549545527, 1884336977574, 6873201390579]

cp's OEIS Frontend

A268069 Number of n X 1 0..3 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

Table of values

List of values