Convolution of natural numbers with Beatty sequence for tau^2 A001950.

Terms

a(0) =2a(1) =9a(2) =23a(3) =47a(4) =84a(5) =136a(6) =206a(7) =296a(8) =409a(9) =548a(10) =715a(11) =913a(12) =1145a(13) =1413a(14) =1720a(15) =2068a(16) =2460a(17) =2899a(18) =3387a(19) =3927a(20) =4521a(21) =5172a(22) =5883a(23) =6656a(24) =7494a(25) =8400a(26) =9376a(27) =10425a(28) =11549a(29) =12751