0,6

The sequence a is the limit of the square array A321396 means, that for every fixed k the terms in column k of A321396 differ from a(k) only for finitely many indices.

Table of n, a(n) for n=0..37.

terms = 38; gf[-1] = 1; gf[n_] := gf[n] = (1-Sqrt[1-4z^2 gf[n -1]])/(2z);

row[n_] := row[n] = gf[n]/z^n + O[z]^terms // CoefficientList[#, z]&;

row[n = 1]; row[n++]; While[Print[n]; row[n] != row[n-1], n++];

A321397 = row[n] (* Jean-François Alcover, Dec 08 2018 *)

Cf. A321396.

Sequence in context: A073709 A085288 A124630 * A128015 A233256 A218953

Adjacent sequences: A321394 A321395 A321396 * A321398 A321399 A321400

nonn

Peter Luschny, Nov 11 2018

approved