G.f.: A(x) = ...o x/(1-x^7) o x/(1-x^5) o x/(1-x^3) o x/(1-x), a composition of functions x/(1-x^(2*n-1)) for n=...3,2,1.

A206721

G.f.: A(x) = ...o x/(1-x^7) o x/(1-x^5) o x/(1-x^3) o x/(1-x), a composition of functions x/(1-x^(2*n-1)) for n=...3,2,1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =12a(6) =28a(7) =65a(8) =155a(9) =387a(10) =1002a(11) =2641a(12) =7016a(13) =18743a(14) =50321a(15) =135608a(16) =366399a(17) =992221a(18) =2693705a(19) =7333666a(20) =20026582a(21) =54858122a(22) =150739957a(23) =415479332a(24) =1148563576a(25) =3183963911a(26) =8848963329a(27) =24650364462a(28) =68810859415a(29) =192439812663

External references