%I #12 Jun 01 2023 10:04:58

%S 3,10,25,52,95,158,245,360,507,690,913,1180,1495,1862,2285,2768,3315,

%T 3930,4617,5380,6223,7150,8165,9272,10475,11778,13185,14700,16327,

%U 18070,19933,21920,24035,26282,28665,31188,33855,36670,39637

%N Row 3 of array in A047666.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4, -6, 4, -1).

%F a(n) = (n/3) * (2n^2 + 7).

%K nonn

%O 1,1

%A _N. J. A. Sloane_