A264018 - cp's OEIS frontend

A264018 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,2 or 2,2.

n	a(n)
1	1
2	5
3	25
4	105
5	441
6	1869
7	7921
8	33553
9	142129
10	602069
11	2550409
12	10803705
13	45765225
14	193864605
15	821223649
16	3478759201
17	14736260449
18	62423800997
19	264431464441
20	1120149658761
21	4745030099481
22	20100270056685
23	85146110326225

[1, 5, 25, 105, 441, 1869, 7921, 33553, 142129, 602069, 2550409, 10803705, 45765225, 193864605, 821223649, 3478759201, 14736260449, 62423800997, 264431464441, 1120149658761, 4745030099481, 20100270056685, 85146110326225]

cp's OEIS Frontend

A264018 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,2 or 2,2.

Table of values

List of values