A285391 - cp's OEIS frontend

A285391 Start with a single cell at coordinates (0, 0), then iteratively subdivide the grid into 3 X 3 cells and remove the cells whose sum of modulo 2 coordinates is 2; a(n) is the number of cells after n iterations.

n	a(n)
0	1
1	8
2	60
3	444
4	3276
5	24156
6	178092
7	1312956
8	9679500
9	71360028
10	526086252
11	3878455932
12	28593068364
13	210796144092
14	1554048476460
15	11456882559036
16	84463361313804
17	622687661115804
18	4590628614276588
19	33843405595099644
20	249503106984577740
21	1839407095720003932

[1, 8, 60, 444, 3276, 24156, 178092, 1312956, 9679500, 71360028, 526086252, 3878455932, 28593068364, 210796144092, 1554048476460, 11456882559036, 84463361313804, 622687661115804, 4590628614276588, 33843405595099644, 249503106984577740, 1839407095720003932]

cp's OEIS Frontend

A285391 Start with a single cell at coordinates (0, 0), then iteratively subdivide the grid into 3 X 3 cells and remove the cells whose sum of modulo 2 coordinates is 2; a(n) is the number of cells after n iterations.

Table of values

List of values