|
|
A374649
|
|
a(n) = n! - 2(n-1)! + 3(n-2)!.
|
|
2
|
|
|
3, 5, 18, 90, 552, 3960, 32400, 297360, 3024000, 33747840, 410054400, 5388768000, 76161254400, 1151998848000, 18568976025600, 317764871424000, 5753767219200000, 109907415281664000, 2208818928476160000, 46590073456582656000, 1029117549458718720000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
2,1
|
|
LINKS
|
|
|
FORMULA
|
D-finite with recurrence a(n) +(-n-2)*a(n-1) +(2*n-1)*a(n-2) +3*(-n+4)*a(n-3)=0. - R. J. Mathar, Jul 30 2024
|
|
MAPLE
|
n!-2*(n-1)!+3*(n-2)! ;
end proc:
|
|
MATHEMATICA
|
Table[n! - 2 (n - 1)! + 3 (n - 2)!, {n, 2, 25}]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|