A035819 Coordination sequence for lattice D*_68 (with edges defined by l_1 norm = 1).

1, 136, 9248, 419288, 14260416, 388134888, 8807231072, 171389157176, 2920221095296, 44261088117832, 604286975278752, 7507398039179160, 85587416923429440, 901728467693644200, 8833008614958340320

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=68.

Crossrefs

Sequence in context: A249237 A194014 A248452 * A233086 A278185 A225832

Adjacent sequences: A035816 A035817 A035818 * A035820 A035821 A035822

Keyword

nonn

Author

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

Status

approved