A224861 - cp's OEIS frontend

A224861 Number T(n,k) of tilings of an n X k rectangle using integer-sided square tiles reduced for symmetry, where the orbits under the symmetry group of the rectangle, D2, have 2 elements; triangle T(n,k), k >= 1, 0 <= n < k, read by columns.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	4
11	0
12	0
13	3
14	3
15	15
16	0
17	0
18	4
19	9
20	38
21	75
22	0
23	0
24	9
25	9
26	68
27	77
28	604
29	0
30	0
31	13
32	21
33	160
34	311
35	2384
36	4556

[0, 0, 0, 0, 0, 1, 0, 0, 1, 4, 0, 0, 3, 3, 15, 0, 0, 4, 9, 38, 75, 0, 0, 9, 9, 68, 77, 604, 0, 0, 13, 21, 160, 311, 2384, 4556]