|
|
A092277
|
|
a(n) = 7*n^2 + n.
|
|
2
|
|
|
0, 8, 30, 66, 116, 180, 258, 350, 456, 576, 710, 858, 1020, 1196, 1386, 1590, 1808, 2040, 2286, 2546, 2820, 3108, 3410, 3726, 4056, 4400, 4758, 5130, 5516, 5916, 6330, 6758, 7200, 7656, 8126, 8610, 9108, 9620, 10146, 10686, 11240, 11808, 12390, 12986, 13596
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
After 0:
8 = -(1) + (2+3+4).
30 = -(1+2) + (3+4+5+6+7+8).
66 = -(1+2+3) + (4+5+6+7+8+9+10+11+12).
116 = -(1+2+3+4) + (5+6+7+8+9+10+11+12+13+14+15+16). (End)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Evgeniy A. Chukhlomin (dkea(AT)yandex.ru), Feb 18 2004
|
|
STATUS
|
approved
|
|
|
|