A114938 - cp's OEIS frontend

A114938 Number of permutations of the multiset {1,1,2,2,...,n,n} with no two consecutive terms equal.

n	a(n)
0	1
1	0
2	2
3	30
4	864
5	39480
6	2631600
7	241133760
8	29083420800
9	4467125013120
10	851371260364800
11	197158144895712000
12	54528028997584665600
13	17752366094818747392000
14	6720318485119046923315200
15	2927066537906697348594432000
16	1453437879238150456164433920000

[1, 0, 2, 30, 864, 39480, 2631600, 241133760, 29083420800, 4467125013120, 851371260364800, 197158144895712000, 54528028997584665600, 17752366094818747392000, 6720318485119046923315200, 2927066537906697348594432000, 1453437879238150456164433920000]

cp's OEIS Frontend

A114938 Number of permutations of the multiset {1,1,2,2,...,n,n} with no two consecutive terms equal.

Table of values

List of values