Express 1 - x - x^2 - x^3 - x^4 - ... as product (1 + g(1)*x) * (1 + g(2)*x^2) *(1 + g(3)*x^3) * ... and use a(n) = - g(n).
A220418
Express 1 - x - x^2 - x^3 - x^4 - ... as product (1 + g(1)*x) * (1 + g(2)*x^2) *(1 + g(3)*x^3) * ... and use a(n) = - g(n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =18a(7) =27a(8) =54a(9) =84a(10) =186a(11) =296a(12) =630a(13) =1008a(14) =2106a(15) =3711a(16) =7710a(17) =12924a(18) =27594a(19) =48528a(20) =97902a(21) =173352a(22) =364722a(23) =647504a(24) =1340622a(25) =2382660a(26) =4918482a(27) =9052392a(28) =18512790a(29) =33361776
External references
- oeis: A220418