login
A276704
Records in A249859.
1
3, 5, 6, 21, 45, 77, 117, 165, 221, 285, 357, 437, 525, 621, 725, 837, 957, 1085, 1221, 1365, 1517, 1677, 1845, 2021, 2205, 2397, 2597, 2805, 3021, 3245, 3477, 3717, 3965, 4221, 4485, 4757, 5037, 5325, 5621, 5925, 6237, 6557, 6885, 7221, 7565, 7917, 8277
OFFSET
1,1
COMMENTS
The indices of the records seem to be 4 and the odd integers.
FORMULA
Conjectures: (Start)
a(n) = 4*n^2-12*n+5 for n>3.
a(n) = 3*a(n-1)-3*a(n-2)+a(n-3) for n>6.
G.f.: x*(3-4*x+15*x^3-5*x^4-x^5) / (1-x)^3.
(End)
CROSSREFS
Sequence in context: A168156 A295403 A272440 * A103022 A086189 A137082
KEYWORD
nonn
AUTHOR
Colin Barker, Sep 15 2016
STATUS
approved