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A002881 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 1
10 0
11 0
12 9
13 34
14 104
15 283
16 953
17 3029
18 9513
19 30359
20 98969
21 323646
22 1080659
23 3668432
24 12608491

[0,0,0,0,0,0,0,0,1,0,0,9,34,104,283,953,3029,9513,
 30359,98969,323646,1080659,3668432,12608491]

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Last modified January 24 04:31 EST 2018. Contains 298115 sequences.