A105218 - cp's OEIS frontend

A105218 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^3.

n	a(n)
0	0
1	1
2	12
3	117
4	1168
5	12525
6	145836
7	1844017
8	25238592
9	372320793
10	5894109100
11	99712850061
12	1795703361552
13	34303011804997
14	692863434782988
15	14754105717057225
16	330351159979499776
17	7758672154410196017
18	190717243734190845132
19	4896738903385469500453

[0, 1, 12, 117, 1168, 12525, 145836, 1844017, 25238592, 372320793, 5894109100, 99712850061, 1795703361552, 34303011804997, 692863434782988, 14754105717057225, 330351159979499776, 7758672154410196017, 190717243734190845132, 4896738903385469500453]

cp's OEIS Frontend

A105218 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^3.

Table of values

List of values

cp's OEIS Frontend

A105218 a(n) = Sum_{k=0..n} C(n,k)^2*(n-k)!*k^3.

Table of values

List of values

A105218 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^3.