A146278 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A146278 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	5
8	17
9	29
10	45
11	101
12	297
13	821
14	2819
15	10635
16	50419
17	205159
18	928911
19	4321051
20	24702095
21	144781137
22	1031901327
23	7307383577
24	64959695293
25	541722263927
26	5441453632793

[1,1,1,1,1,1,5,17,29,45,101,297,821,2819,10635, 50419,205159,928911,4321051,24702095,144781137, 1031901327,7307383577,64959695293,541722263927, 5441453632793]