a(n) = Pell(n)*A033719(n) for n>=1, with a(0)=1, where A033719 lists the coefficients in theta_3(q)*theta_3(q^7).

A209454

a(n) = Pell(n)*A033719(n) for n>=1, with a(0)=1, where A033719 lists the coefficients in theta_3(q)*theta_3(q^7).

Terms

    a(0) =1a(1) =2a(2) =0a(3) =0a(4) =24a(5) =0a(6) =0a(7) =338a(8) =1632a(9) =1970a(10) =0a(11) =22964a(12) =0a(13) =0a(14) =0a(15) =0a(16) =2824992a(17) =0a(18) =0a(19) =0a(20) =0a(21) =0a(22) =0a(23) =900234724a(24) =0a(25) =2623476242a(26) =0a(27) =0a(28) =36915112104a(29) =178241928596

External references