Nearest integer to n^2/8.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =5a(7) =6a(8) =8a(9) =10a(10) =13a(11) =15a(12) =18a(13) =21a(14) =25a(15) =28a(16) =32a(17) =36a(18) =41a(19) =45a(20) =50a(21) =55a(22) =61a(23) =66a(24) =72a(25) =78a(26) =85a(27) =91a(28) =98a(29) =105