A017978 - OEIS

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A017978 as a simple table

n	a(n)
0	1
1	5
2	24
3	118
4	576
5	2822
6	13824
7	67724
8	331776
9	1625364
10	7962624
11	39008732
12	191102976
13	936209560
14	4586471424
15	22469029418
16	110075314176
17	539256706016
18	2641807540224
19	12942160944372
20	63403380965376

[1,5,24,118,576,2822,13824,67724,331776,1625364, 7962624,39008732,191102976,936209560,4586471424, 22469029418,110075314176,539256706016, 2641807540224,12942160944372,63403380965376]