A329475 - cp's OEIS frontend

A329475 a(n) = Sum_{k=0..n} C(n,k)^2T(k)T(n-k), where T(k) = A002426(k) is the coefficient of x^k in the expansion of (x^2+x+1)^k.

n	a(n)
0	1
1	2
2	10
3	68
4	586
5	5252
6	49204
7	475400
8	4723786
9	47937812
10	494786260
11	5177188040
12	54794164660
13	585565913480
14	6309889976680
15	68484312535568
16	747985368753226
17	8214968193003860
18	90669516557975524
19	1005156080857529768
20	11187435500257898836
21	124964856185950621832

[1, 2, 10, 68, 586, 5252, 49204, 475400, 4723786, 47937812, 494786260, 5177188040, 54794164660, 585565913480, 6309889976680, 68484312535568, 747985368753226, 8214968193003860, 90669516557975524, 1005156080857529768, 11187435500257898836, 124964856185950621832]

cp's OEIS Frontend

A329475 a(n) = Sum_{k=0..n} C(n,k)^2T(k)T(n-k), where T(k) = A002426(k) is the coefficient of x^k in the expansion of (x^2+x+1)^k.

Table of values

List of values

cp's OEIS Frontend

A329475 a(n) = Sum_{k=0..n} C(n,k)^2*T(k)*T(n-k), where T(k) = A002426(k) is the coefficient of x^k in the expansion of (x^2+x+1)^k.

Table of values

List of values

A329475 a(n) = Sum_{k=0..n} C(n,k)^2T(k)T(n-k), where T(k) = A002426(k) is the coefficient of x^k in the expansion of (x^2+x+1)^k.