A199904 - cp's OEIS frontend

A199904 Number of -3..3 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	4
3	24
4	72
5	256
6	1312
7	5206
8	21208
9	97668
10	422052
11	1819620
12	8158144
13	36110122
14	159422584
15	712790438
16	3182921756
17	14206099012
18	63688577860
19	285783359204
20	1282956672032
21	5770687400200
22	25983122754016
23	117074268243396

[1, 4, 24, 72, 256, 1312, 5206, 21208, 97668, 422052, 1819620, 8158144, 36110122, 159422584, 712790438, 3182921756, 14206099012, 63688577860, 285783359204, 1282956672032, 5770687400200, 25983122754016, 117074268243396]

cp's OEIS Frontend

A199904 Number of -3..3 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