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A216778 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 3
5 20
6 130
7 924
8 7413
9 66744
10 667476
11 7342280
12 88107415
13 1145396460
14 16035550518
15 240533257860
16 3848532125865
17 65425046139824
18 1177650830516968
19 22375365779822544
20 447507315596451051
21 9397653627525472260
22 206748379805560389930
23 4755212735527888968620

[1,0,0,0,3,20,130,924,7413,66744,667476,7342280,
 88107415,1145396460,16035550518,240533257860,
 3848532125865,65425046139824,1177650830516968,
 22375365779822544,447507315596451051,
 9397653627525472260,206748379805560389930,
 4755212735527888968620]

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)