A217930 Number of sequences of n 2's and 3's with curling number 2, which have the form XY^2 with Y = 2, and which are not robust.

0, 1, 0, 0, 0, 1, 0, 2, 0, 4, 1, 7, 1, 18, 0, 32, 5, 65, 5, 130, 4, 261, 19, 504, 16, 1043, 20, 2028, 81, 4043, 82, 8155, 81

Offset

1,8

Comments

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.

Links

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

Index entries for sequences related to curling numbers

Crossrefs

Cf. A217832, A217929.

Sequence in context: A239004 A168036 A371499 * A393513 A305371 A355018

Adjacent sequences: A217927 A217928 A217929 * A217931 A217932 A217933

Keyword

nonn

Author

N. J. A. Sloane, Oct 15 2012

Status

approved