If there were a unimodular 25-dimensional lattice with minimal norm 3, it would have this as its theta series. Unfortunately, no such lattice exists.

A027824

If there were a unimodular 25-dimensional lattice with minimal norm 3, it would have this as its theta series. Unfortunately, no such lattice exists.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =3600a(4) =101250a(5) =1308960a(6) =10627200a(7) =62596800a(8) =290984400a(9) =1127417600a(10) =3784631040a(11) =11325193200a(12) =30820816800a(13) =77376189600a(14) =181349280000a(15) =400953775680a(16) =842626285650

External references