A027642(6*n+6)/(sequence of period 2:repeat 42,210).

Terms

a(0) =1a(1) =13a(2) =19a(3) =13a(4) =341a(5) =9139a(6) =43a(7) =221a(8) =19a(9) =270413a(10) =1541a(11) =667147a(12) =79a(13) =16211a(14) =6479a(15) =21437a(16) =103a(17) =996151a(18) =1a(19) =11086933a(20) =103759a(21) =20033a(22) =6533a(23) =11341499a(24) =51491a(25) =8545667a(26) =3097a(27) =16211a(28) =59a(29) =34408161359