A199905 - cp's OEIS frontend

A199905 Number of -4..4 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).

n	a(n)
1	1
2	6
3	42
4	152
5	804
6	5016
7	24864
8	139148
9	814776
10	4509164
11	25781576
12	149525280
13	856571710
14	4954153908
15	28801991844
16	167153096856
17	973462118580
18	5682734337828
19	33191217303840
20	194193233863080
21	1137757795417530

[1, 6, 42, 152, 804, 5016, 24864, 139148, 814776, 4509164, 25781576, 149525280, 856571710, 4954153908, 28801991844, 167153096856, 973462118580, 5682734337828, 33191217303840, 194193233863080, 1137757795417530]

cp's OEIS Frontend

A199905 Number of -4..4 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).

Table of values

List of values