A276704 Records in A249859.

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.

Links

Table of n, a(n) for n=1..47.

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

Cf. A249859, A276705.

Sequence in context: A168156 A295403 A272440 * A103022 A086189 A137082

Adjacent sequences: A276701 A276702 A276703 * A276705 A276706 A276707

Keyword

nonn

Author

Colin Barker, Sep 15 2016

Status

approved