1,4

Let S be a sequence of n 2's and 3's with curling number 2 and which has the form XY^2 with Y = 2. S is robust if no proper suffix of S^3 has curling number > 2.

Table of n, a(n) for n=1..33.

Index entries for sequences related to curling numbers

Cf. A217832, A217930.

Sequence in context: A026731 A026764 A027230 * A320465 A259544 A294376

Adjacent sequences: A217926 A217927 A217928 * A217930 A217931 A217932

nonn

N. J. A. Sloane, Oct 15 2012

approved