A102773 - cp's OEIS frontend

A102773 a(n) = Sum_{i=0..n} binomial(n,i)^2i!4^i.

n	a(n)
0	1
1	5
2	49
3	709
4	13505
5	318181
6	8916145
7	289283429
8	10656031489
9	439039941445
10	19995858681521
11	997184081617285
12	54026137182982849
13	3159127731435043109
14	198258247783634075185
15	13289190424904891606821
16	947419111092028780186625

[1, 5, 49, 709, 13505, 318181, 8916145, 289283429, 10656031489, 439039941445, 19995858681521, 997184081617285, 54026137182982849, 3159127731435043109, 198258247783634075185, 13289190424904891606821, 947419111092028780186625]

cp's OEIS Frontend

A102773 a(n) = Sum_{i=0..n} binomial(n,i)^2i!4^i.

Table of values

List of values

cp's OEIS Frontend

A102773 a(n) = Sum_{i=0..n} binomial(n,i)^2*i!*4^i.

Table of values

List of values

A102773 a(n) = Sum_{i=0..n} binomial(n,i)^2i!4^i.