A076884 - OEIS

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A076884 as a simple table

n	a(n)
1	1
2	2
3	8
4	27
5	86
6	272
7	856
8	2691
9	8456
10	26567
11	83464
12	262212
13	823765
14	2587936
15	8130242
16	25541910
17	80242278
18	252088553
19	791959548
20	2488014300
21	7816327449
22	24555716893
23	77144059796
24	242355211525

[1,2,8,27,86,272,856,2691,8456,26567,83464,262212, 823765,2587936,8130242,25541910,80242278, 252088553,791959548,2488014300,7816327449, 24555716893,77144059796,242355211525]