(d(n)-r(n))/5, where d = A008778 and r is the periodic sequence with fundamental period (0,3,1,0,1).

A026053

(d(n)-r(n))/5, where d = A008778 and r is the periodic sequence with fundamental period (0,3,1,0,1).

Terms

    a(0) =1a(1) =2a(2) =5a(3) =9a(4) =14a(5) =21a(6) =29a(7) =40a(8) =53a(9) =68a(10) =86a(11) =106a(12) =130a(13) =157a(14) =187a(15) =221a(16) =258a(17) =300a(18) =346a(19) =396a(20) =451a(21) =510a(22) =575a(23) =645a(24) =720a(25) =801a(26) =887a(27) =980a(28) =1079a(29) =1184

External references