A193639 - cp's OEIS frontend

A193639 Triangle T(n,k) of ways n couples can sit in a row with exactly k of them together.

n	a(n)
0	1
1	0
2	2
3	8
4	8
5	8
6	240
7	288
8	144
9	48
10	13824
11	15744
12	8064
13	2304
14	384
15	1263360
16	1401600
17	710400
18	211200
19	38400
20	3840
21	168422400
22	183582720
23	92620800
24	28108800
25	5529600
26	691200
27	46080
28	30865121280
29	33223034880
30	16717639680
31	5148057600
32	1061222400
33	149022720
34	13547520
35	645120

[1, 0, 2, 8, 8, 8, 240, 288, 144, 48, 13824, 15744, 8064, 2304, 384, 1263360, 1401600, 710400, 211200, 38400, 3840, 168422400, 183582720, 92620800, 28108800, 5529600, 691200, 46080, 30865121280, 33223034880, 16717639680, 5148057600, 1061222400, 149022720, 13547520, 645120]

cp's OEIS Frontend

A193639 Triangle T(n,k) of ways n couples can sit in a row with exactly k of them together.

Table of values

List of values