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A000957 as a simple table

n a(n)
0 0
1 1
2 0
3 1
4 2
5 6
6 18
7 57
8 186
9 622
10 2120
11 7338
12 25724
13 91144
14 325878
15 1174281
16 4260282
17 15548694
18 57048048
19 210295326
20 778483932
21 2892818244
22 10786724388
23 40347919626
24 151355847012
25 569274150156
26 2146336125648
27 8110508473252
28 30711521221376

[0,1,0,1,2,6,18,57,186,622,2120,7338,25724,91144,
 325878,1174281,4260282,15548694,57048048,
 210295326,778483932,2892818244,10786724388,
 40347919626,151355847012,569274150156,
 2146336125648,8110508473252,30711521221376]

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Last modified August 21 06:07 EDT 2018. Contains 313934 sequences. (Running on oeis4.)