Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives k values.

A053678

Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives k values.

Terms

    a(0) =5a(1) =17a(2) =191a(3) =1412a(4) =2143a(5) =8393a(6) =5346a(7) =32475a(8) =99234a(9) =158712a(10) =393981a(11) =401023a(12) =514617a(13) =921485a(14) =577350a(15) =910495a(16) =1430793a(17) =3236406a(18) =462236a(19) =4122855

External references