A185830 - cp's OEIS frontend

A185830 Half the number of n X 4 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

n	a(n)
1	2
2	23
3	118
4	514
5	2398
6	11789
7	54223
8	257050
9	1213538
10	5716561
11	26960702
12	127201987
13	599792318
14	2828918061
15	13342117403
16	62924057051
17	296766436047
18	1399631468891
19	6601012746804
20	31132105093032
21	146827124366034
22	692474808791206

[2, 23, 118, 514, 2398, 11789, 54223, 257050, 1213538, 5716561, 26960702, 127201987, 599792318, 2828918061, 13342117403, 62924057051, 296766436047, 1399631468891, 6601012746804, 31132105093032, 146827124366034, 692474808791206]

cp's OEIS Frontend

A185830 Half the number of n X 4 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

List of values