a(n)=sqrt(A127856(n)).

Terms

a(0) =6a(1) =66a(2) =786a(3) =954a(4) =1446a(5) =2142a(6) =6282a(7) =9426a(8) =13158a(9) =16194a(10) =16314a(11) =37470a(12) =113106a(13) =1221462a(14) =1357266a(15) =1380018a(16) =2739402a(17) =3442866a(18) =16287186a(19) =39360078a(20) =72999726a(21) =138846414a(22) =175958202a(23) =195446226a(24) =228662046a(25) =319612062a(26) =355291902a(27) =1200435786