Indices of spheres mentioned in A071609.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =13a(5) =23a(6) =35a(7) =63a(8) =76a(9) =86a(10) =123a(11) =163a(12) =226a(13) =264a(14) =287a(15) =374a(16) =514a(17) =523a(18) =576a(19) =664a(20) =715a(21) =787a(22) =924a(23) =927a(24) =963a(25) =1074a(26) =1137a(27) =1364a(28) =1487a(29) =1576