First elements of maximal isospectral chains of length 4.

Terms

a(0) =488880a(1) =1525680a(2) =2870280a(3) =4930272a(4) =5890248a(5) =6374664a(6) =8862984a(7) =9658080a(8) =9739080a(9) =10338480a(10) =10544544a(11) =12719880a(12) =13985712a(13) =14777280a(14) =15543216a(15) =16109280a(16) =16293600a(17) =16682400a(18) =16747848a(19) =17722080a(20) =19376136a(21) =20822472a(22) =22178736a(23) =22842288a(24) =25517232a(25) =26056368a(26) =26927280