Number of points of L1 norm 3 in cubic lattice Z^n.

Terms

a(0) =0a(1) =2a(2) =12a(3) =38a(4) =88a(5) =170a(6) =292a(7) =462a(8) =688a(9) =978a(10) =1340a(11) =1782a(12) =2312a(13) =2938a(14) =3668a(15) =4510a(16) =5472a(17) =6562a(18) =7788a(19) =9158a(20) =10680a(21) =12362a(22) =14212a(23) =16238a(24) =18448a(25) =20850a(26) =23452a(27) =26262a(28) =29288a(29) =32538