A245925 - cp's OEIS frontend

A245925 G.f.: Sum_{n>=0} x^nSum_{k=0..n} (-1)^k C(n,k)^2 * Sum_{j=0..k} C(k,j)^2 * x^j.

n	a(n)
0	1
1	-3
2	25
3	-243
4	2601
5	-29403
6	344569
7	-4141875
8	50737129
9	-630663003
10	7930793025
11	-100681224075
12	1288236350025
13	-16592960274075
14	214939203248025
15	-2797935722568243
16	36578032462268649
17	-480000660000226875
18	6320012816203363489
19	-83462977778600141643
20	1105193229806740453201

[1, -3, 25, -243, 2601, -29403, 344569, -4141875, 50737129, -630663003, 7930793025, -100681224075, 1288236350025, -16592960274075, 214939203248025, -2797935722568243, 36578032462268649, -480000660000226875, 6320012816203363489, -83462977778600141643, 1105193229806740453201]

cp's OEIS Frontend

A245925 G.f.: Sum_{n>=0} x^nSum_{k=0..n} (-1)^k C(n,k)^2 * Sum_{j=0..k} C(k,j)^2 * x^j.

Table of values

List of values

cp's OEIS Frontend

A245925 G.f.: Sum_{n>=0} x^n*Sum_{k=0..n} (-1)^k * C(n,k)^2 * Sum_{j=0..k} C(k,j)^2 * x^j.

Table of values

List of values

A245925 G.f.: Sum_{n>=0} x^nSum_{k=0..n} (-1)^k C(n,k)^2 * Sum_{j=0..k} C(k,j)^2 * x^j.