A122105 - cp's OEIS frontend

A122105 Sum of the bottom levels of all columns 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)
0	0
1	0
2	0
3	1
4	11
5	101
6	932
7	9080
8	94852
9	1066644
10	12905784
11	167622984
12	2330016768
13	34551794304
14	544873631616
15	9110134903680
16	161038110977280
17	3001678242428160
18	58853489050759680
19	1211082030609016320
20	26101332373130496000
21	588033071962511616000

[0, 0, 0, 1, 11, 101, 932, 9080, 94852, 1066644, 12905784, 167622984, 2330016768, 34551794304, 544873631616, 9110134903680, 161038110977280, 3001678242428160, 58853489050759680, 1211082030609016320, 26101332373130496000, 588033071962511616000]

cp's OEIS Frontend

A122105 Sum of the bottom levels of all columns 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