A208873 - cp's OEIS frontend

A208873 Number of 2 X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

n	a(n)
1	2
2	12
3	136
4	1798
5	24472
6	334618
7	4578580
8	62655190
9	857412640
10	11733394642
11	160567489036
12	2197311225838
13	30069453572632
14	411490201499818
15	5631102858140740
16	77059719245016070
17	1054535937228511120

[2, 12, 136, 1798, 24472, 334618, 4578580, 62655190, 857412640, 11733394642, 160567489036, 2197311225838, 30069453572632, 411490201499818, 5631102858140740, 77059719245016070, 1054535937228511120]

cp's OEIS Frontend

A208873 Number of 2 X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

Table of values

List of values