A052569 - 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

A052569 as a simple table

n	a(n)
0	1
1	1
2	2
3	12
4	48
5	240
6	2160
7	15120
8	120960
9	1451520
10	14515200
11	159667200
12	2395008000
13	31135104000
14	435891456000
15	7846046208000
16	125536739328000
17	2134124568576000
18	44816615940096000
19	851515702861824000

[1,1,2,12,48,240,2160,15120,120960,1451520, 14515200,159667200,2395008000,31135104000, 435891456000,7846046208000,125536739328000, 2134124568576000,44816615940096000, 851515702861824000]