Inverse Moebius transform applied twice to squares.

Terms

a(0) =1a(1) =6a(2) =11a(3) =27a(4) =27a(5) =66a(6) =51a(7) =112a(8) =102a(9) =162a(10) =123a(11) =297a(12) =171a(13) =306a(14) =297a(15) =453a(16) =291a(17) =612a(18) =363a(19) =729a(20) =561a(21) =738a(22) =531a(23) =1232a(24) =678a(25) =1026a(26) =922a(27) =1377a(28) =843a(29) =1782