A121579 - cp's OEIS frontend

A121579 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n>=1, k>=0).

n	a(n)
1	1
2	2
3	5
4	1
5	16
6	8
7	65
8	52
9	3
10	326
11	344
12	50
13	1957
14	2473
15	595
16	15
17	13700
18	19676
19	6524
20	420
21	109601
22	173472
23	71862
24	7840
25	105
26	986410
27	1686912
28	823836
29	127232
30	4410
31	9864101
32	17981193
33	9976686
34	1975750
35	118125
36	945
37	108505112
38	208769296
39	128350992

[1, 2, 5, 1, 16, 8, 65, 52, 3, 326, 344, 50, 1957, 2473, 595, 15, 13700, 19676, 6524, 420, 109601, 173472, 71862, 7840, 105, 986410, 1686912, 823836, 127232, 4410, 9864101, 17981193, 9976686, 1975750, 118125, 945, 108505112, 208769296, 128350992]

cp's OEIS Frontend

A121579 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n>=1, k>=0).

Table of values

List of values