A187987 - cp's OEIS frontend

A187987 Number of nondecreasing arrangements of n numbers x(i) in -(n+6)..(n+6) with the sum of sign(x(i))*2^|x(i)| zero.

n	a(n)
1	0
2	8
3	17
4	72
5	267
6	915
7	3407
8	12148
9	43820
10	158361
11	570132
12	2058621
13	7429283
14	26823311
15	96904923
16	350182773
17	1266059030
18	4579170527
19	16568732508
20	59974168593
21	217170088270
22	786671363225
23	2850611975840
24	10333040668513
25	37467797814236
26	135900958160905

[0, 8, 17, 72, 267, 915, 3407, 12148, 43820, 158361, 570132, 2058621, 7429283, 26823311, 96904923, 350182773, 1266059030, 4579170527, 16568732508, 59974168593, 217170088270, 786671363225, 2850611975840, 10333040668513, 37467797814236, 135900958160905]

cp's OEIS Frontend

A187987 Number of nondecreasing arrangements of n numbers x(i) in -(n+6)..(n+6) with the sum of sign(x(i))*2^|x(i)| zero.

Table of values

List of values