A276772 Triangle read by rows: Number of D-classes in Partial Brauer Monoid PB_n.

1, 1, 2, 4, 8, 10, 16, 52, 70, 76, 100, 356, 644, 740, 764, 676, 3176, 6376, 8776, 9376, 9496, 5776, 30112, 75112, 113512, 135112, 139432, 140152, 53824, 336848, 933080, 1668080, 2138480, 2350160, 2385440, 2390480

Offset

0,3

Links

Table of n, a(n) for n=0..35.

I Dolinka, J East, RD Gray, Motzkin monoids and partial Brauer monoids, arXiv preprint arXiv:1512.02279, 2015. See Table 2.

Example

Triangle begins:
1,
1,2,
4,8,10,
16,52,70,76,
100,356,644,740,764,
676,3176,6376,8776,9376,9496,
5776,30112,75112,113512,135112,139432,140152,
53824,336848,933080,1668080,2138480,2350160,2385440,2390480,
...

Crossrefs

Sequence in context: A097214 A045579 A177050 * A173063 A066363 A122636

Adjacent sequences: A276769 A276770 A276771 * A276773 A276774 A276775

Keyword

nonn,tabl

Author

N. J. A. Sloane, Sep 17 2016

Status

approved