Let v = (1,4,9,...,n^2), x = (0,1,2,4,6,...) [first n terms of A002620]; a(n) = v.v * x.x - (v.x)^2.

A060452

Let v = (1,4,9,...,n^2), x = (0,1,2,4,6,...) [first n terms of A002620]; a(n) = v.v * x.x - (v.x)^2.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =38a(4) =107a(5) =350a(6) =728a(7) =1752a(8) =3090a(9) =6215a(10) =9878a(11) =17654a(12) =26117a(13) =42924a(14) =60256a(15) =93024a(16) =125460a(17) =184509a(18) =241110a(19) =341110a(20) =434511a(21) =595562a(22) =742808a(23) =991640a(24) =1215110a(25) =1586403a(26) =1914822a(27) =2452646a(28) =2922185a(29) =3681560

External references