a(n) is both the sum of n+1 consecutive integers and the sum of the n immediately higher consecutive integers.

A059270

a(n) is both the sum of n+1 consecutive integers and the sum of the n immediately higher consecutive integers.

Terms

    a(0) =0a(1) =3a(2) =15a(3) =42a(4) =90a(5) =165a(6) =273a(7) =420a(8) =612a(9) =855a(10) =1155a(11) =1518a(12) =1950a(13) =2457a(14) =3045a(15) =3720a(16) =4488a(17) =5355a(18) =6327a(19) =7410a(20) =8610a(21) =9933a(22) =11385a(23) =12972a(24) =14700a(25) =16575a(26) =18603a(27) =20790a(28) =23142a(29) =25665

External references