a(n) = Sum_{k=1..n} k * floor(sqrt(2*k-1)).

Terms

a(0) =1a(1) =3a(2) =9a(3) =17a(4) =32a(5) =50a(6) =71a(7) =95a(8) =131a(9) =171a(10) =215a(11) =263a(12) =328a(13) =398a(14) =473a(15) =553a(16) =638a(17) =728a(18) =842a(19) =962a(20) =1088a(21) =1220a(22) =1358a(23) =1502a(24) =1677a(25) =1859a(26) =2048a(27) =2244a(28) =2447a(29) =2657