A024396 - cp's OEIS frontend

A024396 a(n) = ( Product {k = 1..n} 3k - 1 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).

n	a(n)
1	1
2	3
3	34
4	294
5	4996
6	72612
7	1661680
8	34029840
9	981118240
10	25947526560
11	902963019520
12	29279156256000
13	1193967167680000
14	45861003136704000
15	2144641818280192000
16	95220827527499520000
17	5023176259163442688000
18	253121597596239128064000
19	14869466904778827894784000

[1, 3, 34, 294, 4996, 72612, 1661680, 34029840, 981118240, 25947526560, 902963019520, 29279156256000, 1193967167680000, 45861003136704000, 2144641818280192000, 95220827527499520000, 5023176259163442688000, 253121597596239128064000, 14869466904778827894784000]

cp's OEIS Frontend

A024396 a(n) = ( Product {k = 1..n} 3k - 1 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).

Table of values

List of values

cp's OEIS Frontend

A024396 a(n) = ( Product {k = 1..n} 3*k - 1 ) * ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).

Table of values

List of values

A024396 a(n) = ( Product {k = 1..n} 3k - 1 ) ( Sum {k = 1..n} (-1)^(k+1)/(3*k - 1) ).