Sum of the lengths of the arithmetic progressions in {1,2,3,...,n}, including trivial arithmetic progressions of lengths 1 and 2.

A264100

Sum of the lengths of the arithmetic progressions in {1,2,3,...,n}, including trivial arithmetic progressions of lengths 1 and 2.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =12a(4) =26a(5) =50a(6) =82a(7) =130a(8) =188a(9) =265a(10) =358a(11) =473a(12) =602a(13) =765a(14) =944a(15) =1151a(16) =1386a(17) =1657a(18) =1948a(19) =2284a(20) =2642a(21) =3048a(22) =3490a(23) =3972a(24) =4480a(25) =5056a(26) =5666a(27) =6322a(28) =7022a(29) =7784

External references