Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly two ways.

A076455

Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly two ways.

Terms

    a(0) =5a(1) =57a(2) =246a(3) =710a(4) =1635a(5) =3255a(6) =5852a(7) =9756a(8) =15345a(9) =23045a(10) =33330a(11) =46722a(12) =63791a(13) =85155a(14) =111480a(15) =143480a(16) =181917a(17) =227601a(18) =281390a(19) =344190a(20) =416955a(21) =500687a(22) =596436a(23) =705300a(24) =828425a(25) =967005a(26) =1122282a(27) =1295546a(28) =1488135a(29) =1701435

External references