A068402 - 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

A068402 as a simple table

n	a(n)
1	4
2	6
3	32
4	38
5	54
6	56
7	84
8	278
9	2664
10	10944
11	15608
12	20720
13	84800
14	179576
15	209664
16	6251904
17	85505600
18	125226624
19	584003328
20	19018936320
21	20534891040
22	79185129984
23	87065548800
24	191904215040
25	964494300024

[4,6,32,38,54,56,84,278,2664,10944,15608,20720, 84800,179576,209664,6251904,85505600,125226624, 584003328,19018936320,20534891040,79185129984, 87065548800,191904215040,964494300024]