A268010 - cp's OEIS frontend

A268010 Number of 1Xn 0..n 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	40
6	154
7	656
8	3074
9	15616
10	85360
11	498464
12	3092450
13	20286360
14	140153382
15	1016262080
16	7710988372
17	61062381784
18	503482376930
19	4313580705728
20	38328590370762
21	352618807559008
22	3353663977088848
23	32927374589861296

[1, 2, 4, 12, 40, 154, 656, 3074, 15616, 85360, 498464, 3092450, 20286360, 140153382, 1016262080, 7710988372, 61062381784, 503482376930, 4313580705728, 38328590370762, 352618807559008, 3353663977088848, 32927374589861296]

cp's OEIS Frontend

A268010 Number of 1Xn 0..n 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