A034620 Theta series of extremal 3-modular even lattice in dimension 20.

1, 0, 540, 21120, 286740, 2132352, 10878300, 44012160, 146719620, 417436800, 1093070376, 2572283520, 5570541780, 11568510720, 22583167200, 41422741632, 75113550180, 129368897280, 214148621340

Offset

0,3

Links

Table of n, a(n) for n=0..18.

H.-G. Quebbemann, Modular lattices in Euclidean spaces, J. Number Theory, 54 (1995), 190-202.

Formula

G.f.: t(x)^10 - 60*t(x)^4*d(x) where t(x) is the g.f. for A004016 and d(x) is the g.f. for A007332. - Sean A. Irvine, Oct 25 2025

Crossrefs

Sequence in context: A146123 A159207 A101705 * A146196 A054562 A056934

Adjacent sequences: A034617 A034618 A034619 * A034621 A034622 A034623

Keyword

nonn,changed

Author

N. J. A. Sloane

Status

approved