A121754 - cp's OEIS frontend

A121754 Number of columns ending at an even level in all deco polyominoes of height n. 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	6
4	31
5	211
6	1530
7	13086
8	120888
9	1260792
10	14140080
11	174692880
12	2304970560
13	32969263680
14	500368821120
15	8139251433600
16	139686867532800
17	2547638477798400
18	48786683184691200
19	986263089841612800

[0, 1, 6, 31, 211, 1530, 13086, 120888, 1260792, 14140080, 174692880, 2304970560, 32969263680, 500368821120, 8139251433600, 139686867532800, 2547638477798400, 48786683184691200, 986263089841612800]

cp's OEIS Frontend

A121754 Number of columns ending at an even level in all deco polyominoes of height n. 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