A379623 - cp's OEIS frontend

A379623 Irregular triangle read by rows: T(n,k) is the number of free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	4
7	1
8	5
9	6
10	1
11	12
12	22
13	1
14	18
15	71
16	18
17	1
18	37
19	193
20	138
21	1
22	60
23	490
24	661
25	73
26	1
27	117
28	1221
29	2547
30	769
31	1
32	200
33	3011
34	8417
35	5189
36	255
37	1
38	379
39	7393
40	26164
41	25920
42	3743
43	1
44	669
45	18025
46	78074
47	108834
48	32038
49	950
50	1
51	1250
52	43847
53	229881
54	408217
55	201956
56	16819

[1, 1, 1, 1, 1, 4, 1, 5, 6, 1, 12, 22, 1, 18, 71, 18, 1, 37, 193, 138, 1, 60, 490, 661, 73, 1, 117, 1221, 2547, 769, 1, 200, 3011, 8417, 5189, 255, 1, 379, 7393, 26164, 25920, 3743, 1, 669, 18025, 78074, 108834, 32038, 950, 1, 1250, 43847, 229881, 408217, 201956, 16819]

cp's OEIS Frontend

A379623 Irregular triangle read by rows: T(n,k) is the number of free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2).

Table of values

List of values