A222839 - cp's OEIS frontend

A222839 Number of n X 2 0..3 arrays with no more than n elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

n	a(n)
1	1
2	8
3	105
4	1585
5	23107
6	353631
7	5338646
8	81874696
9	1252153841
10	19270376854
11	296641979113
12	4580055753005
13	70780702170260
14	1095722113681548
15	16978656325074532
16	263390892198118920
17	4089414898741050209
18	63545865459514492673
19	988136631583140164460
20	15375690197520184535506

[1, 8, 105, 1585, 23107, 353631, 5338646, 81874696, 1252153841, 19270376854, 296641979113, 4580055753005, 70780702170260, 1095722113681548, 16978656325074532, 263390892198118920, 4089414898741050209, 63545865459514492673, 988136631583140164460, 15375690197520184535506]

cp's OEIS Frontend

A222839 Number of n X 2 0..3 arrays with no more than n elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

Table of values

List of values