a(n) = Pell(n)*A002652(n) for n>=1, with a(0)=1, where A002652 lists the coefficients in theta series of Kleinian lattice Z[(-1+sqrt(-7))/2].

A209455

a(n) = Pell(n)*A002652(n) for n>=1, with a(0)=1, where A002652 lists the coefficients in theta series of Kleinian lattice Z[(-1+sqrt(-7))/2].

Terms

    a(0) =1a(1) =2a(2) =8a(3) =0a(4) =72a(5) =0a(6) =0a(7) =338a(8) =3264a(9) =1970a(10) =0a(11) =22964a(12) =0a(13) =0a(14) =323128a(15) =0a(16) =4708320a(17) =0a(18) =10976840a(19) =0a(20) =0a(21) =0a(22) =745778864a(23) =900234724a(24) =0a(25) =2623476242a(26) =0a(27) =0a(28) =110745336312a(29) =178241928596

External references