A133306 - cp's OEIS frontend

A133306 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)5^i6^(n-i), a(0)=1.

n	a(n)
0	1
1	6
2	66
3	906
4	13926
5	229326
6	3956106
7	70572066
8	1291183806
9	24095736726
10	456879955026
11	8776867331706
12	170459895028566
13	3341423256586206
14	66023812564384026
15	1313634856606430226
16	26295597219228901806
17	529199848207277494566
18	10701116421278640683106
19	217317899302044152030826

[1, 6, 66, 906, 13926, 229326, 3956106, 70572066, 1291183806, 24095736726, 456879955026, 8776867331706, 170459895028566, 3341423256586206, 66023812564384026, 1313634856606430226, 26295597219228901806, 529199848207277494566, 10701116421278640683106, 217317899302044152030826]

cp's OEIS Frontend

A133306 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)5^i6^(n-i), a(0)=1.

Table of values

List of values

cp's OEIS Frontend

A133306 a(n) = (1/n)*Sum_{i=0..n-1} C(n,i)*C(n,i+1)*5^i*6^(n-i), a(0)=1.

Table of values

List of values

A133306 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)5^i6^(n-i), a(0)=1.