A105219 - cp's OEIS frontend

A105219 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^2.

n	a(n)
0	0
1	1
2	8
3	63
4	544
5	5225
6	55656
7	653023
8	8379008
9	116780049
10	1757211400
11	28394129951
12	490371506208
13	9013522796473
14	175679564492264
15	3618800515187775
16	78547755741723136
17	1791704327280481313
18	42846080320725932808
19	1071798626271975328639
20	27989931083161219661600

[0, 1, 8, 63, 544, 5225, 55656, 653023, 8379008, 116780049, 1757211400, 28394129951, 490371506208, 9013522796473, 175679564492264, 3618800515187775, 78547755741723136, 1791704327280481313, 42846080320725932808, 1071798626271975328639, 27989931083161219661600]

cp's OEIS Frontend

A105219 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^2.

Table of values

List of values

cp's OEIS Frontend

A105219 a(n) = Sum_{k=0..n} C(n,k)^2*(n-k)!*k^2.

Table of values

List of values

A105219 a(n) = Sum_{k=0..n} C(n,k)^2(n-k)!k^2.