OFFSET
1,2
MATHEMATICA
(* This program is not suitable to compute more than a dozen terms. *)
notVis[bits_] := For[i = 0, True, i++, If[SequencePosition[bits, IntegerDigits[i, 2]] == {}, Return[i]]];
T[n_, k_] := Select[Rest[IntegerDigits[#, 2]] & /@ Range[2^n, 2^(n+1) - 1], notVis[#] == k &] // Length;
a[n_] := Do[If[T[n, k] > 0, Return[k]], {k, 2^n - 1, 0, -1}];
Table[an = a[n]; Print["a(", n, ") = ", an]; an, {n, 1, 12}] (* Jean-François Alcover, Aug 02 2018 *)
PROG
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Aug 17 2015
EXTENSIONS
a(5)-a(17) from Alois P. Heinz, Aug 17 2015
a(18)-a(25) from Reinhard Zumkeller, Aug 18 2015
a(26)-a(36) from Alois P. Heinz, Aug 19 2015
a(37)-a(58) from Hiroaki Yamanouchi, Aug 23 2015
STATUS
approved