Number of n-dimensional unimodular lattices (or quadratic forms) containing no vectors of norm 1.

A054907

Number of n-dimensional unimodular lattices (or quadratic forms) containing no vectors of norm 1.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =0a(10) =0a(11) =0a(12) =1a(13) =0a(14) =1a(15) =1a(16) =3a(17) =1a(18) =4a(19) =3a(20) =12a(21) =12a(22) =28a(23) =49a(24) =180a(25) =368a(26) =1901a(27) =14493a(28) =357003

External references