A085939 - OEIS

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A085939 as a simple table

n	a(n)
0	0
1	1
2	4
3	22
4	112
5	580
6	2992
7	15448
8	79744
9	411664
10	2125120
11	10970464
12	56632576
13	292353088
14	1509207808
15	7790949760
16	40219045888
17	207621882112
18	1071801803776
19	5532938507776
20	28562564853760

[0,1,4,22,112,580,2992,15448,79744,411664,2125120, 10970464,56632576,292353088,1509207808,7790949760, 40219045888,207621882112,1071801803776, 5532938507776,28562564853760]