A208275 - cp's OEIS frontend

A208275 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^11^1 and 1^22^1 in the pattern sense.

n	a(n)
1	2
2	5
3	10
4	21
5	46
6	107
7	262
8	675
9	1818
10	5105
11	14882
12	44929
13	140070
14	450055
15	1487294
16	5047327
17	17562546
18	62578845
19	228062522
20	849213293
21	3227667742
22	12511072803
23	49417391350
24	198758992859
25	813460577482
26	3385607683977
27	14320923895890
28	61532392279385

[2, 5, 10, 21, 46, 107, 262, 675, 1818, 5105, 14882, 44929, 140070, 450055, 1487294, 5047327, 17562546, 62578845, 228062522, 849213293, 3227667742, 12511072803, 49417391350, 198758992859, 813460577482, 3385607683977, 14320923895890, 61532392279385]

cp's OEIS Frontend

A208275 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^11^1 and 1^22^1 in the pattern sense.

Table of values

List of values