A122104 - cp's OEIS frontend

A122104 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and such that the sum of the bottom levels of all columns is k (n>=1, k>=0; informally, the number of the "missing" cells in the right bottom corner of the polyomino). 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	1
2	2
3	5
4	1
5	16
6	5
7	3
8	65
9	23
10	20
11	10
12	2
13	326
14	119
15	115
16	84
17	57
18	11
19	8
20	1957
21	719
22	714
23	582
24	526
25	310
26	137
27	55
28	34
29	6
30	13700
31	5039
32	5033
33	4222
34	4173
35	3291
36	2506
37	972
38	748
39	348
40	220
41	38
42	30
43	109601
44	40319
45	40312
46	34026
47	34454
48	29792
49	28055
50	18723
51	10613
52	6745

[1, 2, 5, 1, 16, 5, 3, 65, 23, 20, 10, 2, 326, 119, 115, 84, 57, 11, 8, 1957, 719, 714, 582, 526, 310, 137, 55, 34, 6, 13700, 5039, 5033, 4222, 4173, 3291, 2506, 972, 748, 348, 220, 38, 30, 109601, 40319, 40312, 34026, 34454, 29792, 28055, 18723, 10613, 6745]

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