Positions of records in A188172.

Terms

a(0) =1a(1) =7a(2) =63a(3) =315a(4) =945a(5) =1575a(6) =3465a(7) =10395a(8) =17325a(9) =26775a(10) =45045a(11) =135135a(12) =225225a(13) =405405a(14) =675675a(15) =1576575a(16) =2027025a(17) =2297295a(18) =3828825a(19) =6891885a(20) =11486475a(21) =26801775a(22) =34459425a(23) =43648605a(24) =72747675a(25) =130945815a(26) =218243025a(27) =509233725a(28) =654729075a(29) =1003917915