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A059518
a(n)/n^2 is the minimal average squared Euclidean distance of n points to their center of gravity among all configurations of n points on the hexagonal lattice.
2
0, 1, 3, 8, 17, 29, 42, 69, 99, 135, 181, 228, 299, 371, 464, 560, 668, 788, 912, 1093, 1275, 1463, 1667, 1895, 2137, 2403, 2673, 2997, 3346, 3705, 4092, 4503, 4923, 5370, 5853, 6363, 6882, 7512, 8154, 8813, 9488, 10164, 10924, 11693, 12506, 13361
OFFSET
1,3
LINKS
EXAMPLE
a(2)=1 because the squared distance of (0,0) and of (1,0) to their center of gravity (1/2,0) is 1/4, resulting in an average of 1/4 = a(2)/2^2.
CROSSREFS
Sequence in context: A294412 A227017 A073433 * A024929 A033816 A011889
KEYWORD
nonn,nice
AUTHOR
Zsolt Kukorelly (kukorell(AT)code.ucsd.edu), Feb 15 2001
EXTENSIONS
a(44) corrected by Sean A. Irvine, Oct 02 2022
STATUS
approved