A209797 - cp's OEIS frontend

A209797 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^11^2 and 1^22^1 in the pattern sense.

n	a(n)
1	2
2	6
3	18
4	56
5	188
6	695
7	2838
8	12726
9	62140
10	327760
11	1854488
12	11189273
13	71627546
14	484332314
15	3446042310
16	25712613664
17	200599911596
18	1632055365951
19	13814906940846
20	121414108567114
21	1105838412755384
22	10420517690466168
23	101439025287805552
24	1018689421191417393

[2, 6, 18, 56, 188, 695, 2838, 12726, 62140, 327760, 1854488, 11189273, 71627546, 484332314, 3446042310, 25712613664, 200599911596, 1632055365951, 13814906940846, 121414108567114, 1105838412755384, 10420517690466168, 101439025287805552, 1018689421191417393]

cp's OEIS Frontend

A209797 The number of partitions of the set [n] where each element can be colored 1 or 2 avoiding the patterns 1^11^2 and 1^22^1 in the pattern sense.

Table of values

List of values