|
|
A101634
|
|
Subtract 1, multiply by 1, subtract 2, multiply by 2, etc.
|
|
0
|
|
|
6, 5, 6, 9, 20, 75, 414, 2849, 22728, 204471, 2044610, 22490589, 269886924, 3508529843, 49119417606, 736791263865, 11788660221584, 200407223766639, 3607330027799178, 68539270528184021, 1370785410563680020
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Inspired by A019460. a(1) = 6 is the least integer producing all nonnegative terms.
|
|
LINKS
|
|
|
FORMULA
|
Recurrence: a(1) = 6; a(n+1) = n*a(n) - n^2. [Edited by Georg Fischer, Dec 28 2021]
|
|
MATHEMATICA
|
a=6; bb={a}; Do[b=i(a-i); a=b; bb={bb, a}, {i, 20}]; Flatten[bb]
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|