A322894 - cp's OEIS frontend

A322894 a(n) = A322893(n) / (n(n+1)/2), where A322893(n) = [x^(n-1)] Product_{k=1..n} (k + x + 2k*x^2), for n >= 1.

n	a(n)
1	1
2	1
3	7
4	31
5	411
6	3571
7	69581
8	927837
9	23794485
10	433057989
11	13747956267
12	319028238387
13	12059110543767
14	341371258373471
15	14956914818390169
16	500785356155724985
17	24937841088996528425
18	965337309260747987273
19	53822060004016654090607
20	2367108984768411034367975
21	146026942863362312725861811
22	7196976785684064477225272171
23	486563915009872154819986680357

[1, 1, 7, 31, 411, 3571, 69581, 927837, 23794485, 433057989, 13747956267, 319028238387, 12059110543767, 341371258373471, 14956914818390169, 500785356155724985, 24937841088996528425, 965337309260747987273, 53822060004016654090607, 2367108984768411034367975, 146026942863362312725861811, 7196976785684064477225272171, 486563915009872154819986680357]

cp's OEIS Frontend

A322894 a(n) = A322893(n) / (n(n+1)/2), where A322893(n) = [x^(n-1)] Product_{k=1..n} (k + x + 2k*x^2), for n >= 1.

Table of values

List of values

cp's OEIS Frontend

A322894 a(n) = A322893(n) / (n*(n+1)/2), where A322893(n) = [x^(n-1)] Product_{k=1..n} (k + x + 2*k*x^2), for n >= 1.

Table of values

List of values

A322894 a(n) = A322893(n) / (n(n+1)/2), where A322893(n) = [x^(n-1)] Product_{k=1..n} (k + x + 2k*x^2), for n >= 1.