A056340 - OEIS

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A056340 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	12
8	142
9	1346
10	11511
11	89974
12	662673
13	4662574
14	31724723
15	210361046
16	1367510184
17	8752976610
18	55343946628
19	346541488998
20	2153041576027
21	13292844257186
22	81652683460145
23	499484958151630

[0,0,0,0,0,1,12,142,1346,11511,89974,662673, 4662574,31724723,210361046,1367510184,8752976610, 55343946628,346541488998,2153041576027, 13292844257186,81652683460145,499484958151630]