A199899 - cp's OEIS frontend

A199899 Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

n	a(n)
1	15
2	49
3	111
4	209
5	351
6	545
7	799
8	1121
9	1519
10	2001
11	2575
12	3249
13	4031
14	4929
15	5951
16	7105
17	8399
18	9841
19	11439
20	13201
21	15135
22	17249
23	19551
24	22049
25	24751
26	27665
27	30799
28	34161
29	37759
30	41601
31	45695
32	50049
33	54671
34	59569
35	64751
36	70225
37	75999
38	82081
39	88479
40	95201

[15, 49, 111, 209, 351, 545, 799, 1121, 1519, 2001, 2575, 3249, 4031, 4929, 5951, 7105, 8399, 9841, 11439, 13201, 15135, 17249, 19551, 22049, 24751, 27665, 30799, 34161, 37759, 41601, 45695, 50049, 54671, 59569, 64751, 70225, 75999, 82081, 88479, 95201]

cp's OEIS Frontend

A199899 Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

Table of values

List of values