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 A014452 Theta series of quadratic form with Gram matrix [ 1, 0, 0; 0, 2, 1; 0, 1, 2 ]. 3
 1, 2, 6, 12, 2, 0, 18, 12, 6, 14, 12, 12, 12, 0, 12, 36, 2, 12, 42, 12, 0, 0, 24, 24, 18, 14, 12, 48, 12, 0, 48, 12, 6, 36, 12, 24, 14, 0, 24, 48, 12, 12, 72, 36, 12, 0, 24, 24, 12, 14, 30, 72, 0, 0, 54, 24, 12, 48, 36, 12, 36, 0, 36, 84, 2, 24, 48, 36, 12, 0, 24, 24, 42, 24, 36, 60, 12 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS This is the hexagonal P lattice (the classical holotype) of dimension 3. LINKS John Cannon, Table of n, a(n) for n = 0..10000 G. Nebe and N. J. A. Sloane, Home page for this lattice EXAMPLE 1 + 2*q + 6*q^2 + 12*q^3 + 2*q^4 + 18*q^6 + 12*q^7 + 6*q^8 + 14*q^9 + 12*q^10 + ... CROSSREFS Sequence in context: A293589 A293117 A293122 * A188894 A054579 A277962 Adjacent sequences:  A014449 A014450 A014451 * A014453 A014454 A014455 KEYWORD nonn AUTHOR STATUS approved

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Last modified June 13 15:33 EDT 2021. Contains 345008 sequences. (Running on oeis4.)