A215953 - cp's OEIS frontend

A215953 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an n X 2 array with new integer colors introduced in row major order.

n	a(n)
1	1
2	1
3	2
4	4
5	12
6	34
7	136
8	500
9	2440
10	10900
11	61912
12	322768
13	2075312
14	12297768
15	87852160
16	580849872
17	4548247264
18	33093252880
19	281121815712
20	2227152575552
21	20358402201792
22	174131286983712
23	1701534399324544
24	15604440074084672

[1, 1, 2, 4, 12, 34, 136, 500, 2440, 10900, 61912, 322768, 2075312, 12297768, 87852160, 580849872, 4548247264, 33093252880, 281121815712, 2227152575552, 20358402201792, 174131286983712, 1701534399324544, 15604440074084672]

cp's OEIS Frontend

A215953 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an n X 2 array with new integer colors introduced in row major order.

Table of values

List of values