G.f.: Product_{n>=1} (1 - A002203(n)*x^n + (-1)^n*x^(2*n))^3 where A002203(n) is the companion Pell numbers.

A204383

G.f.: Product_{n>=1} (1 - A002203(n)*x^n + (-1)^n*x^(2*n))^3 where A002203(n) is the companion Pell numbers.

Terms

    a(0) =1a(1) =-6a(2) =-9a(3) =70a(4) =90a(5) =0a(6) =-1411a(7) =-1722a(8) =0a(9) =490a(10) =60534a(11) =75222a(12) =49a(13) =-21510a(14) =0a(15) =-6067754a(16) =-7542180a(17) =0a(18) =2156110a(19) =0a(20) =81a(21) =1420032740a(22) =1764323886a(23) =0a(24) =-504516870a(25) =-8118a(26) =0a(27) =-50196874a(28) =-783087782910a(29) =-973096740630

External references