A320947 - cp's OEIS frontend

A320947 a(n) is the number of dominoes, among all domino tilings of the 2 X n rectangle, sharing a length-2 side with the boundary of the rectangle.

n	a(n)
1	1
2	4
3	8
4	16
5	30
6	56
7	102
8	184
9	328
10	580
11	1018
12	1776
13	3082
14	5324
15	9160
16	15704
17	26838
18	45736
19	77742
20	131840
21	223112
22	376844
23	635378
24	1069536
25	1797650
26	3017236
27	5057672
28	8467744
29	14161038
30	23657240
31	39482358
32	65832136
33	109671112
34	182552404
35	303629290

[1, 4, 8, 16, 30, 56, 102, 184, 328, 580, 1018, 1776, 3082, 5324, 9160, 15704, 26838, 45736, 77742, 131840, 223112, 376844, 635378, 1069536, 1797650, 3017236, 5057672, 8467744, 14161038, 23657240, 39482358, 65832136, 109671112, 182552404, 303629290]

cp's OEIS Frontend

A320947 a(n) is the number of dominoes, among all domino tilings of the 2 X n rectangle, sharing a length-2 side with the boundary of the rectangle.

Table of values

List of values