A128012 a(n) = 3*A001399(n).

3, 3, 6, 9, 12, 15, 21, 24, 30, 36, 42, 48, 57, 63, 72, 81, 90, 99, 111, 120, 132, 144, 156, 168, 183, 195, 210, 225, 240, 255, 273, 288, 306, 324, 342, 360, 381, 399, 420, 441, 462, 483, 507, 528, 552, 576, 600, 624, 651, 675, 702, 729, 756, 783, 813, 840, 870

Offset

0,1

Comments

Total number of parts in all partitions of (n+3) into 3 parts. - Alois P. Heinz, Mar 11 2025

Links

Table of n, a(n) for n=0..56.

Index entries for linear recurrences with constant coefficients, signature (1,1,0,-1,-1,1).

Formula

G.f.: -3/((x+1)*(x^2+x+1)*(x-1)^3). - Alois P. Heinz, Mar 11 2025

Crossrefs

Cf. A001399.

Sequence in context: A093445 A098358 A136289 * A289143 A323451 A280240

Adjacent sequences: A128009 A128010 A128011 * A128013 A128014 A128015

Keyword

nonn,easy,less,changed

Author

Thomas Wieder, Feb 11 2007

Extensions

More terms from Robert G. Wilson v, Feb 11 2007

Offset corrected by Alois P. Heinz, Sep 02 2020

Status

approved