A373182 - cp's OEIS frontend

A373182 Number of ways that people can sit in n linearly arranged seats such that there are one or two empty seats between any two persons, zero or one empty seats at the start and end, and at least one person gets seated.

n	a(n)
1	1
2	2
3	3
4	6
5	12
6	26
7	60
8	144
9	366
10	960
11	2640
12	7464
13	21960
14	66240
15	206760
16	660240
17	2172240
18	7298640
19	25179840
20	88583040
21	319097520
22	1170650880
23	4387582080
24	16728808320
25	65040796800
26	256987987200
27	1033805566080
28	4222598688000
29	17536408243200
30	73886160096000

[1, 2, 3, 6, 12, 26, 60, 144, 366, 960, 2640, 7464, 21960, 66240, 206760, 660240, 2172240, 7298640, 25179840, 88583040, 319097520, 1170650880, 4387582080, 16728808320, 65040796800, 256987987200, 1033805566080, 4222598688000, 17536408243200, 73886160096000]

cp's OEIS Frontend

A373182 Number of ways that people can sit in n linearly arranged seats such that there are one or two empty seats between any two persons, zero or one empty seats at the start and end, and at least one person gets seated.

Table of values

List of values