A188228 - cp's OEIS frontend

A188228 Number of nondecreasing arrangements of n numbers in -(n-1)..(n-1) with sum zero and not more than two numbers equal.

n	a(n)
1	1
2	2
3	4
4	15
5	58
6	245
7	1082
8	5020
9	24040
10	118154
11	592332
12	3019280
13	15604848
14	81614541
15	431227650
16	2298833499
17	12350952158
18	66818754504
19	363727676848
20	1990946917066
21	10952512200610
22	60525264890259
23	335856363303010
24	1870732844007387

[1, 2, 4, 15, 58, 245, 1082, 5020, 24040, 118154, 592332, 3019280, 15604848, 81614541, 431227650, 2298833499, 12350952158, 66818754504, 363727676848, 1990946917066, 10952512200610, 60525264890259, 335856363303010, 1870732844007387]

cp's OEIS Frontend

A188228 Number of nondecreasing arrangements of n numbers in -(n-1)..(n-1) with sum zero and not more than two numbers equal.

Table of values

List of values