A035812 Coordination sequence for lattice D*_54 (with edges defined by l_1 norm = 1).

1, 108, 5832, 209988, 5672592, 122653980, 2211553368, 34208719092, 463476372768, 5588323254732, 60724672249320, 600778137474468, 5457607130811312, 45848471510756988, 358366157766535032

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=54.

Crossrefs

Sequence in context: A223153 A203028 A138784 * A054624 A147821 A269148

Adjacent sequences: A035809 A035810 A035811 * A035813 A035814 A035815

Keyword

nonn

Author

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

Status

approved