A024217 - cp's OEIS frontend

A024217 a(n) = ( Product {k = 1..n} 3k - 2 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 2) ).

n	a(n)
1	1
2	3
3	25
4	222
5	3166
6	47016
7	951544
8	19827408
9	520029520
10	13952218560
11	449559799360
12	14756761434240
13	563961412362880
14	21893890640563200
15	968019931702297600
16	43385863589508249600
17	2178487766250586470400
18	110704921777161066700800
19	6222745685273069016064000

[1, 3, 25, 222, 3166, 47016, 951544, 19827408, 520029520, 13952218560, 449559799360, 14756761434240, 563961412362880, 21893890640563200, 968019931702297600, 43385863589508249600, 2178487766250586470400, 110704921777161066700800, 6222745685273069016064000]

cp's OEIS Frontend

A024217 a(n) = ( Product {k = 1..n} 3k - 2 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 2) ).

Table of values

List of values

cp's OEIS Frontend

A024217 a(n) = ( Product {k = 1..n} 3*k - 2 ) * ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 2) ).

Table of values

List of values

A024217 a(n) = ( Product {k = 1..n} 3k - 2 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 2) ).