A055320 - 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

A055320 as a simple table

n	a(n)
9	9
10	11430
11	2994750
12	405167400
13	38104981200
14	2861947408320
15	185364917337600
16	10851787634688000
17	592181546628672000
18	30766166997261696000
19	1544883657843618892800
20	75806672148355180032000

[9,11430,2994750,405167400,38104981200, 2861947408320,185364917337600,10851787634688000, 592181546628672000,30766166997261696000, 1544883657843618892800,75806672148355180032000]