A280955 - cp's OEIS frontend

A280955 Number of n X 2 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

n	a(n)
1	2
2	9
3	42
4	205
5	997
6	4850
7	23593
8	114769
9	558298
10	2715861
11	13211405
12	64267362
13	312630929
14	1520804569
15	7398009354
16	35987886621
17	175064388469
18	851607109714
19	4142673879353
20	20152188344737
21	98031056006074
22	476875651282597

[2, 9, 42, 205, 997, 4850, 23593, 114769, 558298, 2715861, 13211405, 64267362, 312630929, 1520804569, 7398009354, 35987886621, 175064388469, 851607109714, 4142673879353, 20152188344737, 98031056006074, 476875651282597]

cp's OEIS Frontend

A280955 Number of n X 2 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Table of values

List of values