A230701 - cp's OEIS frontend

A230701 Number of (n+3) X (1+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

n	a(n)
1	2
2	8
3	30
4	102
5	348
6	1172
7	3956
8	13326
9	44916
10	151338
11	509978
12	1718408
13	5790456
14	19511640
15	65747178
16	221543696
17	746521190
18	2515502046
19	8476319172
20	28562083692
21	96243740012
22	324306077270
23	1092792451740
24	3682309466130
25	12408031373682

[2, 8, 30, 102, 348, 1172, 3956, 13326, 44916, 151338, 509978, 1718408, 5790456, 19511640, 65747178, 221543696, 746521190, 2515502046, 8476319172, 28562083692, 96243740012, 324306077270, 1092792451740, 3682309466130, 12408031373682]

cp's OEIS Frontend

A230701 Number of (n+3) X (1+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Table of values

List of values