A178345 - 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

A178345 as a simple table

n	a(n)
0	1
1	3
2	15
3	70
4	630
5	2772
6	48048
7	205920
8	3500640
9	29560960
10	496624128
11	2076791808
12	138452787200
13	575111577600
14	9530420428800
15	157569617756160
16	5199797385953280
17	21410930412748800
18	1408363422705254400

[1,3,15,70,630,2772,48048,205920,3500640,29560960, 496624128,2076791808,138452787200,575111577600, 9530420428800,157569617756160,5199797385953280, 21410930412748800,1408363422705254400]