A189348 - cp's OEIS frontend

A189348 Number of n X 2 array permutations with each element moving one space diagonally, horizontally or vertically.

n	a(n)
1	1
2	4
3	13
4	45
5	160
6	565
7	2005
8	7108
9	25209
10	89401
11	317056
12	1124425
13	3987721
14	14142276
15	50154949
16	177872293
17	630816160
18	2237161405
19	7933993245
20	28137553540
21	99788579953
22	353895752689
23	1255075518976
24	4451069407761
25	15785519335825

[1, 4, 13, 45, 160, 565, 2005, 7108, 25209, 89401, 317056, 1124425, 3987721, 14142276, 50154949, 177872293, 630816160, 2237161405, 7933993245, 28137553540, 99788579953, 353895752689, 1255075518976, 4451069407761, 15785519335825]

cp's OEIS Frontend

A189348 Number of n X 2 array permutations with each element moving one space diagonally, horizontally or vertically.

Table of values

List of values