A035820 Coordination sequence for lattice D*_70 (with edges defined by l_1 norm = 1).

1, 140, 9800, 457380, 16013200, 448644028, 10479036120, 209901182420, 3681129969440, 57425278222060, 806898799084392, 10316605397801220, 121032811973584560, 1312159718129050140, 13225339591553573880

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=70.

Crossrefs

Sequence in context: A223349 A282613 A202786 * A075915 A159362 A188255

Adjacent sequences: A035817 A035818 A035819 * A035821 A035822 A035823

Keyword

nonn

Author

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

Status

approved