A199896 - cp's OEIS frontend

A199896 Number of -6..6 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

n	a(n)
1	1
2	13
3	67
4	545
5	3573
6	27457
7	193689
8	1462859
9	10651367
10	80142549
11	593254327
12	4466635929
13	33386730231
14	251884546233
15	1894568061637
16	14327147198653
17	108231414777793
18	820328179730055
19	6216861991058925
20	47216885967426099

[1, 13, 67, 545, 3573, 27457, 193689, 1462859, 10651367, 80142549, 593254327, 4466635929, 33386730231, 251884546233, 1894568061637, 14327147198653, 108231414777793, 820328179730055, 6216861991058925, 47216885967426099]

cp's OEIS Frontend

A199896 Number of -6..6 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

Table of values

List of values