A208409 - cp's OEIS frontend

A208409 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 two of its immediate leftward or upward or right-upward antidiagonal neighbors.

n	a(n)
1	2
2	15
3	182
4	2698
5	41914
6	658450
7	10370330
8	163422914
9	2575668586
10	40595679634
11	639841707002
12	10084768380770
13	158949607034890
14	2505261257850802
15	39486313909133978
16	622357842865595522
17	9809203406810575786

[2, 15, 182, 2698, 41914, 658450, 10370330, 163422914, 2575668586, 40595679634, 639841707002, 10084768380770, 158949607034890, 2505261257850802, 39486313909133978, 622357842865595522, 9809203406810575786]

cp's OEIS Frontend

A208409 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 two of its immediate leftward or upward or right-upward antidiagonal neighbors.

Table of values

List of values