a(n) = Sum_{k=0..n} floor((k/2)^2)*n^2. Row sums of A391996.

Terms

a(0) =0a(1) =0a(2) =4a(3) =27a(4) =112a(5) =325a(6) =792a(7) =1666a(8) =3200a(9) =5670a(10) =9500a(11) =15125a(12) =23184a(13) =34307a(14) =49392a(15) =69300a(16) =95232a(17) =128316a(18) =170100a(19) =222015a(20) =286000a(21) =363825a(22) =457864a(23) =570262a(24) =703872a(25) =861250a(26) =1045772a(27) =1260441a(28) =1509200a(29) =1795535