A084077 - OEIS

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A084077 as a simple table

n	a(n)
0	1
1	3
2	11
3	41
4	159
5	633
6	2575
7	10657
8	44735
9	190017
10	815231
11	3527681
12	15378687
13	67478401
14	297777407
15	1320753665
16	5884652543
17	26326301697
18	118211192831
19	532574203905
20	2406726828031
21	10906541371393

[1,3,11,41,159,633,2575,10657,44735,190017,815231, 3527681,15378687,67478401,297777407,1320753665, 5884652543,26326301697,118211192831,532574203905, 2406726828031,10906541371393]

[1,3,11,41,159,633,2575,10657,44735,190017,815231,
 3527681,15378687,67478401,297777407,1320753665,
 5884652543,26326301697,118211192831,532574203905,
 2406726828031,10906541371393]