A190067 - 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

A190067 as a simple table

n	a(n)
1	20
2	143
3	1126
4	9904
5	88509
6	834717
7	7843113
8	73725405
9	697624797
10	6644826507
11	63556636483
12	609902716100
13	5871497904831
14	56683948490522
15	548487091412193
16	5317814454716839
17	51651465543152430
18	502495332741155890

[20,143,1126,9904,88509,834717,7843113,73725405, 697624797,6644826507,63556636483,609902716100, 5871497904831,56683948490522,548487091412193, 5317814454716839,51651465543152430, 502495332741155890]