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

Author

Thomas Wieder, Feb 11 2007

Keywords

• nonn
• easy
• less

Comments

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

Links

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

Crossrefs

Cf. A001399.

Formula

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

Extensions

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

Offset corrected by Alois P. Heinz, Sep 02 2020