A338787 - cp's OEIS frontend

A338787 a(n) = (n!/2) * Sum_{k=1..n-1} A000593(k)A000593(n-k)/(k(n-k)).

n	a(n)
1	0
2	1
3	3
4	35
5	110
6	1594
7	8064
8	125292
9	684144
10	14215536
11	102769920
12	2367099360
13	18380943360
14	463602216960
15	4776780072960
16	141702567955200
17	1382620380825600
18	46390044372940800
19	550153713457152000
20	19877486361997824000
21	261552662423506944000
22	9914502028911427584000
23	146055669195092557824000

[0, 1, 3, 35, 110, 1594, 8064, 125292, 684144, 14215536, 102769920, 2367099360, 18380943360, 463602216960, 4776780072960, 141702567955200, 1382620380825600, 46390044372940800, 550153713457152000, 19877486361997824000, 261552662423506944000, 9914502028911427584000, 146055669195092557824000]

cp's OEIS Frontend

A338787 a(n) = (n!/2) * Sum_{k=1..n-1} A000593(k)A000593(n-k)/(k(n-k)).

Table of values

List of values

cp's OEIS Frontend

A338787 a(n) = (n!/2) * Sum_{k=1..n-1} A000593(k)*A000593(n-k)/(k*(n-k)).

Table of values

List of values

A338787 a(n) = (n!/2) * Sum_{k=1..n-1} A000593(k)A000593(n-k)/(k(n-k)).