%I #9 Sep 25 2017 13:05:22

%S 1,-2,-2,-6,-26,-134,-778,-4950,-33946,-248230,-1921130,-15650358,

%T -133644026,-1192354310,-11084816458,-107138260758,-1074526263898,

%U -11163814083430,-119971275641642,-1331739929195766,-15250978417105082,-179975143242023366

%N Expansion of 1 - 2*x - 2*x^2/(1 - 3*x - 4*x^2/(1 - 4*x - 6*x^2/(1 - 5*x - 8*x^2/(1 - 6*x - 10*x^2/(...))))), a continued fraction.

%F Convolution inverse of A001861.

%e G.f. = 1 - 2*x - 2*x^2 - 6*x^3 - 26*x^4 - 134*x^5 - 778*x^6 - 4950*x^7 - 33946*x^8 - ...

%Y Cf. A001861.

%K sign

%O 0,2

%A _Seiichi Manyama_, Sep 24 2017