A383212 - cp's OEIS frontend

A383212 a(n) = permanent of the n-th principal submatrix of the rectangular array whose odd-numbered rows are (2,1,2,1,2,1,2,1,...) and even-numbered rows are (1,2,1,2,1,2,1,2,...).

n	a(n)
0	1
1	2
2	5
3	24
4	132
5	1032
6	8820
7	95616
8	1106496
9	15327360
10	223560000
11	3768768000
12	66305952000
13	1316927808000
14	27127003680000
15	620221722624000
16	14638710417408000
17	378633583448064000
18	10073602372700160000
19	290788929384726528000
20	8609476463579013120000
21	274361332654900592640000
22	8946658680536444313600000

[1, 2, 5, 24, 132, 1032, 8820, 95616, 1106496, 15327360, 223560000, 3768768000, 66305952000, 1316927808000, 27127003680000, 620221722624000, 14638710417408000, 378633583448064000, 10073602372700160000, 290788929384726528000, 8609476463579013120000, 274361332654900592640000, 8946658680536444313600000]

cp's OEIS Frontend

A383212 a(n) = permanent of the n-th principal submatrix of the rectangular array whose odd-numbered rows are (2,1,2,1,2,1,2,1,...) and even-numbered rows are (1,2,1,2,1,2,1,2,...).

Table of values

List of values