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

A076457

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

Terms

    a(0) =13a(1) =129a(2) =534a(3) =1510a(4) =3435a(5) =6783a(6) =12124a(7) =20124a(8) =31545a(9) =47245a(10) =68178a(11) =95394a(12) =130039a(13) =173355a(14) =226680a(15) =291448a(16) =369189a(17) =461529a(18) =570190a(19) =696990a(20) =843843a(21) =1012759a(22) =1205844a(23) =1425300a(24) =1673425a(25) =1952613a(26) =2265354a(27) =2614234a(28) =3001935a(29) =3431235

External references