A199240 - cp's OEIS frontend

A199240 Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

n	a(n)
1	1
2	2
3	2
4	12
5	36
6	39
7	288
8	836
9	888
10	7380
11	22149
12	23706
13	201515
14	611372
15	654468
16	5704006
17	17499974
18	18760333
19	166063522
20	513160156
21	550594928
22	4932198432
23	15327377362
24	16456851660
25	148765279666
26	464332349724
27	498808175988

[1, 2, 2, 12, 36, 39, 288, 836, 888, 7380, 22149, 23706, 201515, 611372, 654468, 5704006, 17499974, 18760333, 166063522, 513160156, 550594928, 4932198432, 15327377362, 16456851660, 148765279666, 464332349724, 498808175988]

cp's OEIS Frontend

A199240 Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

Table of values

List of values