|
|
A107253
|
|
a(n) = n^4 - 15*n + 15.
|
|
1
|
|
|
1, 1, 51, 211, 565, 1221, 2311, 3991, 6441, 9865, 14491, 20571, 28381, 38221, 50415, 65311, 83281, 104721, 130051, 159715, 194181, 233941, 279511, 331431, 390265, 456601, 531051, 614251, 706861, 809565, 923071, 1048111, 1185441, 1335841
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(2) = 2^4 - 15*2 + 15 = 1;
a(4) = 4^4 - 15*4 + 15 = 211.
|
|
MATHEMATICA
|
LinearRecurrence[{5, -10, 10, -5, 1}, {1, 1, 51, 211, 565}, 40] (* Harvey P. Dale, Nov 23 2019 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Andras Erszegi (erszegi.andras(AT)chello.hu), May 14 2005
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|