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A120304 as a simple table

n a(n)
0 -1
1 -1
2 0
3 3
4 12
5 40
6 130
7 427
8 1428
9 4860
10 16794
11 58784
12 208010
13 742898
14 2674438
15 9694843
16 35357668
17 129644788
18 477638698
19 1767263188
20 6564120418
21 24466267018
22 91482563638
23 343059613648
24 1289904147322
25 4861946401450
26 18367353072150
27 69533550916002
28 263747951750358

[-1,-1,0,3,12,40,130,427,1428,4860,16794,58784,
 208010,742898,2674438,9694843,35357668,129644788,
 477638698,1767263188,6564120418,24466267018,
 91482563638,343059613648,1289904147322,
 4861946401450,18367353072150,69533550916002,
 263747951750358]

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Last modified February 19 02:06 EST 2018. Contains 299330 sequences. (Running on oeis4.)