A035815 Coordination sequence for lattice D*_60 (with edges defined by l_1 norm = 1).

1, 120, 7200, 288040, 8644800, 207648024, 4158723680, 71440725960, 1074729932160, 14385297437880, 173483353200288, 1904315460088680, 19187724061887040, 178728796729801560, 1548407735451345120

Offset

0,2

Links

Table of n, a(n) for n=0..14.

Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.

Formula

a(m)=add(2^k*binomial(n, k)*binomial(m-1, k-1), k=0..n)+2^n*binomial((n+2*m)/2-1, n-1); with n=60.

Crossrefs

Sequence in context: A055213 A035190 A240934 * A001785 A270848 A223960

Adjacent sequences: A035812 A035813 A035814 * A035816 A035817 A035818

Keyword

nonn

Author

N. J. A. Sloane, J. Serra-Sagrista (jserra(AT)ccd.uab.es)

Status

approved