A216457 - cp's OEIS frontend

A216457 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order.

n	a(n)
1	1
2	1
3	7
4	20
5	322
6	1335
7	36401
8	192713
9	7712455
10	49055292
11	2659544320
12	19602119017
13	1367160898137
14	11399696350555
15	986429423363481
16	9146845346099410
17	955922762706415420
18	9731199828137067515
19	1203020866861467699281

[1, 1, 7, 20, 322, 1335, 36401, 192713, 7712455, 49055292, 2659544320, 19602119017, 1367160898137, 11399696350555, 986429423363481, 9146845346099410, 955922762706415420, 9731199828137067515, 1203020866861467699281]

cp's OEIS Frontend

A216457 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order.

Table of values

List of values