A184368 - cp's OEIS frontend

A184368 1/3 the number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having at least two equal elements connected horizontally or vertically.

n	a(n)
1	21
2	153
3	1107
4	8019
5	58077
6	420633
7	3046491
8	22064643
9	159806277
10	1157419449
11	8382773187
12	60713414163
13	439725443661
14	3184773389433
15	23066169329547
16	167059976482179
17	1209955382858997
18	8763272085493593
19	63469230958692531

[21, 153, 1107, 8019, 58077, 420633, 3046491, 22064643, 159806277, 1157419449, 8382773187, 60713414163, 439725443661, 3184773389433, 23066169329547, 167059976482179, 1209955382858997, 8763272085493593, 63469230958692531]

cp's OEIS Frontend

A184368 1/3 the number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having at least two equal elements connected horizontally or vertically.

Table of values

List of values