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

A204385

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

Terms

    a(0) =1a(1) =1a(2) =4a(3) =6a(4) =28a(5) =22a(6) =168a(7) =204a(8) =788a(9) =1108a(10) =5740a(11) =4356a(12) =33460a(13) =39914a(14) =149296a(15) =235416a(16) =1136688a(17) =862466a(18) =6625108a(19) =7452408a(20) =30662688a(21) =46594942a(22) =225058680a(23) =170763912a(24) =1266505772a(25) =1583313340a(26) =6116296036a(27) =9119790204a(28) =44560482148a(29) =30146578648

External references