A182189 - 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

A182189 as a simple table

n	a(n)
0	1
1	3
2	13
3	71
4	409
5	2379
6	13861
7	80783
8	470833
9	2744211
10	15994429
11	93222359
12	543339721
13	3166815963
14	18457556053
15	107578520351
16	627013566049
17	3654502875939
18	21300003689581
19	124145519261543
20	723573111879673

[1,3,13,71,409,2379,13861,80783,470833,2744211, 15994429,93222359,543339721,3166815963, 18457556053,107578520351,627013566049, 3654502875939,21300003689581,124145519261543, 723573111879673]