A178808 - cp's OEIS frontend

A178808 a(n) = (1/n^2) * Sum_{k = 0..n-1} (2k+1)(D_k)^2, where D_0, D_1, ... are central Delannoy numbers given by A001850.

n	a(n)
1	1
2	7
3	97
4	1791
5	38241
6	892039
7	22092673
8	571387903
9	15271248769
10	418796912007
11	11725812711009
12	333962374092543
13	9648543623050593
14	282164539499639559
15	8338391167566634497
16	248661515283002490879
17	7474768663941435203073

[1, 7, 97, 1791, 38241, 892039, 22092673, 571387903, 15271248769, 418796912007, 11725812711009, 333962374092543, 9648543623050593, 282164539499639559, 8338391167566634497, 248661515283002490879, 7474768663941435203073]

cp's OEIS Frontend

A178808 a(n) = (1/n^2) * Sum_{k = 0..n-1} (2k+1)(D_k)^2, where D_0, D_1, ... are central Delannoy numbers given by A001850.

Table of values

List of values

cp's OEIS Frontend

A178808 a(n) = (1/n^2) * Sum_{k = 0..n-1} (2*k+1)*(D_k)^2, where D_0, D_1, ... are central Delannoy numbers given by A001850.

Table of values

List of values

A178808 a(n) = (1/n^2) * Sum_{k = 0..n-1} (2k+1)(D_k)^2, where D_0, D_1, ... are central Delannoy numbers given by A001850.