A268474 - 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

A268474 as a simple table

n	a(n)
1	120
2	19800
3	4140000
4	1007460000
5	269568000000
6	76711698000000
7	22777407360000000
8	6975554646600000000
9	2187027926856000000000
10	698458000786920000000000
11	226405769680425600000000000

[120,19800,4140000,1007460000,269568000000, 76711698000000,22777407360000000, 6975554646600000000,2187027926856000000000, 698458000786920000000000, 226405769680425600000000000]