a(n) = (d(n)-r(n))/2, where d = A026057 and r is the periodic sequence with fundamental period (0,0,1,0).

A026058

a(n) = (d(n)-r(n))/2, where d = A026057 and r is the periodic sequence with fundamental period (0,0,1,0).

Terms

    a(0) =13a(1) =25a(2) =41a(3) =63a(4) =90a(5) =123a(6) =162a(7) =209a(8) =263a(9) =325a(10) =395a(11) =475a(12) =564a(13) =663a(14) =772a(15) =893a(16) =1025a(17) =1169a(18) =1325a(19) =1495a(20) =1678a(21) =1875a(22) =2086a(23) =2313a(24) =2555a(25) =2813a(26) =3087a(27) =3379a(28) =3688a(29) =4015

External references