A215921 - cp's OEIS frontend

A215921 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order.

n	a(n)
1	1
2	2
3	4
4	42
5	136
6	2906
7	12840
8	433252
9	2387180
10	113503692
11	742181112
12	46538017584
13	350038464728
14	27700815674032
15	234578644301776
16	22702140562948192
17	213078984368820288
18	24626774613248937584
19	253140626416265149920

[1, 2, 4, 42, 136, 2906, 12840, 433252, 2387180, 113503692, 742181112, 46538017584, 350038464728, 27700815674032, 234578644301776, 22702140562948192, 213078984368820288, 24626774613248937584, 253140626416265149920]

cp's OEIS Frontend

A215921 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order.

Table of values

List of values