A209629 - cp's OEIS frontend

A209629 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^12^2 and 1^22^1 in the pattern sense.

n	a(n)
1	2
2	6
3	16
4	44
5	134
6	468
7	1880
8	8534
9	42804
10	232972
11	1359186
12	8431288
13	55297064
14	381815026
15	2765949856
16	20960349828
17	165729870678
18	1364153874460
19	11665484934400
20	103448317519318
21	949739634410652
22	9013431481088948
23	88304011718557298
24	891917738606387792

[2, 6, 16, 44, 134, 468, 1880, 8534, 42804, 232972, 1359186, 8431288, 55297064, 381815026, 2765949856, 20960349828, 165729870678, 1364153874460, 11665484934400, 103448317519318, 949739634410652, 9013431481088948, 88304011718557298, 891917738606387792]

cp's OEIS Frontend

A209629 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^12^2 and 1^22^1 in the pattern sense.

Table of values

List of values