The r-th term of the n-th row of the following array contains the sum of r successively decreasing integers beginning from n, 0 < r <= n (see Example).

A110426

The r-th term of the n-th row of the following array contains the sum of r successively decreasing integers beginning from n, 0 < r <= n (see Example).

Terms

    a(0) =1a(1) =3a(2) =3a(3) =-5a(4) =-30a(5) =-84a(6) =-182a(7) =-342a(8) =-585a(9) =-935a(10) =-1419a(11) =-2067a(12) =-2912a(13) =-3990a(14) =-5340a(15) =-7004a(16) =-9027a(17) =-11457a(18) =-14345a(19) =-17745a(20) =-21714a(21) =-26312a(22) =-31602a(23) =-37650a(24) =-44525a(25) =-52299a(26) =-61047a(27) =-70847a(28) =-81780a(29) =-93930

External references