A121633 - cp's OEIS frontend

A121633 Sum of the bottom levels of the last column over 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	0
3	1
4	9
5	68
6	527
7	4408
8	40303
9	403046
10	4393339
11	51955528
12	663383135
13	9102982354
14	133668773755
15	2092209897524
16	34783032728383
17	612234346270510
18	11375905660965179
19	222544581264066400
20	4572536725690159999
21	98456173247669999978
22	2217126753620449439515

[0, 0, 1, 9, 68, 527, 4408, 40303, 403046, 4393339, 51955528, 663383135, 9102982354, 133668773755, 2092209897524, 34783032728383, 612234346270510, 11375905660965179, 222544581264066400, 4572536725690159999, 98456173247669999978, 2217126753620449439515]

cp's OEIS Frontend

A121633 Sum of the bottom levels of the last column over 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