A276775 Triangle read by rows: Ranks of ideals in the Motzkin Monoid M_n.

1, 1, 2, 2, 3, 4, 4, 6, 5, 6, 9, 15, 11, 7, 8, 21, 36, 32, 17, 9, 10, 51, 91, 83, 56, 24, 11, 12, 127, 232, 226, 157, 88, 32, 13, 14, 323, 603, 608, 459, 266, 129, 41, 15, 16, 835, 1585, 1655, 1305, 832, 419, 180, 51, 17, 18, 2188, 4213, 4517, 3726, 2499, 1397, 626, 242, 62, 19, 20

Offset

0,3

Links

Table of n, a(n) for n=0..65.

I Dolinka, J East, RD Gray, Motzkin monoids and partial Brauer monoids, arXiv preprint arXiv:1512.02279, 2015. See Table 4.

Example

Triangle begins:
1,
1,2,
2,3,4,
4,6,5,6,
9,15,11,7,8,
21,36,32,17,9,10,
51,91,83,56,24,11,12,
127,232,226,157,88,32,13,14,
323,603,608,459,266,129,41,15,16,
835,1585,1655,1305,832,419,180,51,17,18,
2188,4213,4517,3726,2499,1397,626,242,62,19,20,
...

Crossrefs

Sequence in context: A113967 A205386 A206922 * A271169 A352745 A224979

Adjacent sequences: A276772 A276773 A276774 * A276776 A276777 A276778

Keyword

nonn,tabl

Author

N. J. A. Sloane, Sep 17 2016

Status

approved