A280784 Triangle read by rows: numbers of nonintersecting circles with one of them marked.

1, 2, 1, 5, 3, 1, 13, 9, 3, 1, 35, 26, 10, 3, 1, 95, 75, 30, 10, 3, 1, 262, 214, 91, 31, 10, 3, 1, 727, 612, 268, 95, 31, 10, 3, 1, 2033, 1747, 790, 284, 96, 31, 10, 3, 1, 5714, 4995, 2308, 848, 288, 96, 31, 10, 3, 1, 16136, 14294, 6737, 2506, 864, 289, 96, 31, 10, 3, 1

Offset

1,2

Links

Table of n, a(n) for n=1..66.

R. J. Mathar, Topologically Distinct Sets of Non-intersecting Circles in the Plane, arXiv:1603.00077 [math.CO], 2016.

Example

Triangle begins:
1,
2,1,
5,3,1,
13,9,3,1,
35,26,10,3,1,
95,75,30,10,3,1,
262,214,91,31,10,3,1,
727,612,268,95,31,10,3,1,
2033,1747,790,284,96,31,10,3,1,
...

Crossrefs

Rows sums are A000243.

Sequence in context: A366858 A047858 A125171 * A048472 A038622 A193954

Adjacent sequences: A280781 A280782 A280783 * A280785 A280786 A280787

Keyword

nonn,tabl

Author

N. J. A. Sloane, Jan 20 2017

Status

approved