A024488 - 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

A024488 as a simple table

n	a(n)
1	3
2	18
3	210
4	3150
5	54054
6	1009008
7	19953648
8	411543990
9	8764362750
10	191413682460
11	4266468608220
12	96706621786320
13	2223107844022800
14	51721284534408000
15	1215794995122150720
16	28837137540553512390

[3,18,210,3150,54054,1009008,19953648,411543990, 8764362750,191413682460,4266468608220, 96706621786320,2223107844022800,51721284534408000, 1215794995122150720,28837137540553512390]