A073385 - 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

A073385 as a simple table

n	a(n)
0	1
1	18
2	189
3	1500
4	9945
5	58014
6	307197
7	1507176
8	6950295
9	30443270
10	127666539
11	515754252
12	2017069431
13	7667214570
14	28419251715
15	102997948704
16	365832349542
17	1275914693196
18	4376992440590

[1,18,189,1500,9945,58014,307197,1507176,6950295, 30443270,127666539,515754252,2017069431, 7667214570,28419251715,102997948704,365832349542, 1275914693196,4376992440590]