A264191 - cp's OEIS frontend

A264191 Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 2,1.

n	a(n)
1	4
2	18
3	81
4	360
5	1600
6	6760
7	28561
8	120666
9	509796
10	2159850
11	9150625
12	38768400
13	164249856
14	695767824
15	2947295521
16	12484841330
17	52886200900
18	224029644930
19	949005240561
20	4020052555512
21	17029223715904
22	72136947419128

[4, 18, 81, 360, 1600, 6760, 28561, 120666, 509796, 2159850, 9150625, 38768400, 164249856, 695767824, 2947295521, 12484841330, 52886200900, 224029644930, 949005240561, 4020052555512, 17029223715904, 72136947419128]

cp's OEIS Frontend

A264191 Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 2,1.

Table of values

List of values