A049222 - cp's OEIS frontend

A049222 Number of horizontally convex n-ominoes in which the top row has exactly 1 square, which is not above the rightmost square in the second row and the rightmost square in the second row is above the leftmost square in the third row.

n	a(n)
1	0
2	0
3	0
4	1
5	4
6	13
7	41
8	130
9	415
10	1329
11	4260
12	13657
13	43781
14	140346
15	449891
16	1442157
17	4622932
18	14819125
19	47503729
20	152276498
21	488132887
22	1564743865
23	5015895108
24	16078800033
25	51541709869
26	165220529546
27	529625878779
28	1697752526549

[0, 0, 0, 1, 4, 13, 41, 130, 415, 1329, 4260, 13657, 43781, 140346, 449891, 1442157, 4622932, 14819125, 47503729, 152276498, 488132887, 1564743865, 5015895108, 16078800033, 51541709869, 165220529546, 529625878779, 1697752526549]

cp's OEIS Frontend

A049222 Number of horizontally convex n-ominoes in which the top row has exactly 1 square, which is not above the rightmost square in the second row and the rightmost square in the second row is above the leftmost square in the third row.

Table of values

List of values