A185837 - 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

A185837 as a simple table

n	a(n)
1	0
2	171
3	405
4	3249
5	12609
6	72225
7	332937
8	1731321
9	8410473
10	42400017
11	209335185
12	1045669905
13	5189897529
14	25851542121
15	128510546841
16	639547289793
17	3180802829697
18	15825291313473
19	78719710355433
20	391617249901785

[0,171,405,3249,12609,72225,332937,1731321, 8410473,42400017,209335185,1045669905,5189897529, 25851542121,128510546841,639547289793, 3180802829697,15825291313473,78719710355433, 391617249901785]