A121751 - cp's OEIS frontend

A121751 Number of deco polyominoes of height n in which all columns end at an even level. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.

n	a(n)
1	0
2	1
3	2
4	4
5	14
6	44
7	194
8	812
9	4362
10	22716
11	144282
12	897636
13	6587454
14	47632188
15	396765018
16	3268365228
17	30471767658
18	281641273164
19	2906047413234
20	29777551585092
21	336912811924014
22	3790278631556172
23	46662633394518258

[0, 1, 2, 4, 14, 44, 194, 812, 4362, 22716, 144282, 897636, 6587454, 47632188, 396765018, 3268365228, 30471767658, 281641273164, 2906047413234, 29777551585092, 336912811924014, 3790278631556172, 46662633394518258]

cp's OEIS Frontend

A121751 Number of deco polyominoes of height n in which all columns end at an even level. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.

Table of values

List of values