Row sums of correlation triangle for floor((n+3)/3).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =13a(5) =20a(6) =31a(7) =44a(8) =61a(9) =84a(10) =111a(11) =144a(12) =186a(13) =234a(14) =291a(15) =360a(16) =438a(17) =528a(18) =634a(19) =752a(20) =886a(21) =1040a(22) =1210a(23) =1400a(24) =1615a(25) =1850a(26) =2110a(27) =2400a(28) =2715a(29) =3060