A231871 Elements of the Schroeder trees sub-operad Schr of TN generated by 00, 01, 10.

1, 11, 12, 21, 111, 112, 121, 122, 123, 132, 211, 212, 221, 231, 321, 1111, 1112, 1121, 1122, 1123, 1132, 1211, 1212, 1221, 1222, 1223, 1231, 1232, 1233, 1234, 1243, 1321, 1322, 1323, 1332, 1342, 1432, 2111, 2112, 2121, 2122, 2123, 2132, 2211, 2212, 2221, 2231, 2311, 2312, 2321, 2331, 2341, 2431, 3211, 3212, 3221, 3231, 3321, 3421, 4321

Offset

1,2

Comments

Since nonzero terms in the OEIS may not begin with 0, 1 has been added to all the digits.

Links

Table of n, a(n) for n=1..60.

S. Giraudo, Combinatorial operads from monoids, arXiv preprint arXiv:1306.6938 [math.CO], 2013-2015.

Crossrefs

Sequence in context: A098754 A098752 A240763 * A192287 A084855 A367612

Adjacent sequences: A231868 A231869 A231870 * A231872 A231873 A231874

Keyword

nonn

Author

N. J. A. Sloane, Nov 14 2013

Status

approved