GCD's arising in A228810.

Terms

a(0) =11a(1) =43a(2) =11a(3) =11a(4) =121a(5) =11a(6) =11a(7) =1153a(8) =109a(9) =97a(10) =11a(11) =11a(12) =11a(13) =11a(14) =11a(15) =19a(16) =2909a(17) =6221a(18) =297889a(19) =3a(20) =3