Number of points of l_1 norm n in the "diamond" lattice D^+_2, i. e. the rectangular lattice generated by vectors (1, 1) and (-1/2, 1/2).
A035877
Number of points of l_1 norm n in the "diamond" lattice D^+_2, i. e. the rectangular lattice generated by vectors (1, 1) and (-1/2, 1/2).
Terms
- a(0) =1a(1) =2a(2) =12a(3) =6a(4) =24a(5) =10a(6) =36a(7) =14a(8) =48a(9) =18a(10) =60a(11) =22a(12) =72a(13) =26a(14) =84a(15) =30a(16) =96a(17) =34a(18) =108a(19) =38a(20) =120a(21) =42a(22) =132a(23) =46a(24) =144a(25) =50a(26) =156a(27) =54a(28) =168a(29) =58
External references
- oeis: A035877