A357870 - 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

A357870 as a simple table

n	a(n)
1	3
2	13
3	51
4	61
5	217
6	846
7	291
8	1001
9	3673
10	14637
11	1393
12	4683
13	16693
14	62221
15	247965
16	6673
17	22265
18	77064
19	282317
20	1054081
21	4200768
22	31971
23	106153
24	360517
25	1285131
26	4778353
27	17857153
28	71165091

[3,13,51,61,217,846,291,1001,3673,14637,1393,4683, 16693,62221,247965,6673,22265,77064,282317, 1054081,4200768,31971,106153,360517,1285131, 4778353,17857153,71165091]