A073361 - 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

A073361 as a simple table

n	a(n)
1	1
2	5
3	15
4	31
5	65
6	105
7	151
8	275
9	420
10	631
11	695
12	1050
13	1411
14	1685
15	2385
16	2941
17	3425
18	4410
19	5326
20	6995
21	7350
22	9316
23	10880

[1,5,15,31,65,105,151,275,420,631,695,1050,1411, 1685,2385,2941,3425,4410,5326,6995,7350,9316, 10880]