A221405 - cp's OEIS frontend

A221405 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

n	a(n)
1	4
2	44
3	436
4	4518
5	47156
6	492102
7	5133044
8	53529806
9	558164472
10	5819704716
11	60677191216
12	632619159318
13	6595610902832
14	68764677891112
15	716926331557236
16	7474513869766556
17	77927543824707370
18	812454058048811426

[4, 44, 436, 4518, 47156, 492102, 5133044, 53529806, 558164472, 5819704716, 60677191216, 632619159318, 6595610902832, 68764677891112, 716926331557236, 7474513869766556, 77927543824707370, 812454058048811426]

cp's OEIS Frontend

A221405 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Table of values

List of values