A211869 - cp's OEIS frontend

A211869 a(n) = Sum_{j=1..n-1} j(n-j)b^(j-1) with b = floor(n^2/4)+1.

n	a(n)
1	0
2	1
3	8
4	98
5	1712
6	58985
7	2541896
8	187337236
9	15687030920
10	2014736789165
11	280434300560320
12	55591630021883014
13	11642487182670742552
14	3294318202343411333713
15	969986091740868071844464
16	371055858906757952457992360

[0, 1, 8, 98, 1712, 58985, 2541896, 187337236, 15687030920, 2014736789165, 280434300560320, 55591630021883014, 11642487182670742552, 3294318202343411333713, 969986091740868071844464, 371055858906757952457992360]

cp's OEIS Frontend

A211869 a(n) = Sum_{j=1..n-1} j(n-j)b^(j-1) with b = floor(n^2/4)+1.

Table of values

List of values

cp's OEIS Frontend

A211869 a(n) = Sum_{j=1..n-1} j*(n-j)*b^(j-1) with b = floor(n^2/4)+1.

Table of values

List of values

A211869 a(n) = Sum_{j=1..n-1} j(n-j)b^(j-1) with b = floor(n^2/4)+1.