Largest proper divisor of Motzkin number A001006(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =17a(5) =1a(6) =19a(7) =167a(8) =1094a(9) =2899a(10) =1a(11) =13945a(12) =56817a(13) =155286a(14) =284489a(15) =785593a(16) =3268191a(17) =9099642a(18) =16950673a(19) =47515853a(20) =133587741a(21) =376586805a(22) =1064242599a(23) =1291914643a(24) =12834909238a(25) =36503886401a(26) =1944142787a(27) =19152993059a(28) =1144562017