a(n) = n*(n-1) + (n-2)*(n-3) + ... + 1*0 + 1 for n odd; otherwise, a(n) = n*(n-1) + (n-2)*(n-3) + ... + 2*1.

A014112

a(n) = n*(n-1) + (n-2)*(n-3) + ... + 1*0 + 1 for n odd; otherwise, a(n) = n*(n-1) + (n-2)*(n-3) + ... + 2*1.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =14a(4) =27a(5) =44a(6) =69a(7) =100a(8) =141a(9) =190a(10) =251a(11) =322a(12) =407a(13) =504a(14) =617a(15) =744a(16) =889a(17) =1050a(18) =1231a(19) =1430a(20) =1651a(21) =1892a(22) =2157a(23) =2444a(24) =2757a(25) =3094a(26) =3459a(27) =3850a(28) =4271a(29) =4720

External references