

A340434


Number of sets in the geometry determined by the Hausdorff metric at each location between two sets defined by a complete bipartite graph K(5,n) (with n at least 4) missing three edges, where all three removed edges are incident to different vertices in the 5point set but all three removed edges are incident to the same vertex in the other set.


0



57152, 2248976, 77784248, 2538972344, 80670722672, 2530567728416, 78896594655848, 2452545943242824, 76130313033068192, 2361561349263377456, 73231232199903981848, 2270510693649412710104, 70390969213953161845712, 2182197113248136520812096, 67649266538598993456642248
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OFFSET

4,1


COMMENTS

Start with a complete bipartite graph K(5,n) with vertex sets A and B where A = 5 and B is at least 4. We can arrange the points in sets A and B such that h(A,B) = d(a,b) for all a in A and b in B, where h is the Hausdorff metric. The pair [A,B] is a configuration. Then a set C is between A and B at location s if h(A,C) = h(C,B) = h(A,B) and h(A,C) = s. Call a pair ab, where a is in A and b is in B an edge. This sequence provides the number of sets between sets A' and B' at location s in a new configuration [A',B'] obtained from [A,B] by removing three edges, where all three removed edges are incident to different points in A but all three removed edges are incident to the same point in B. So this sequence tells the number of sets at each location on the line segment between A' and B'.
Number of {0,1} 5 X n matrices (with n at least 4) with three fixed zero entries all of which are in the same column with no zero rows or columns.
Take a complete bipartite graph K(5,n) (with n at least 4) having parts A and B where A = 5. This sequence gives the number of edge covers of the graph obtained from this K(5,n) graph after removing three edges, where the removed edges are incident to different vertices in A and none of the removed edges are incident to the same vertex in B.


REFERENCES

S. Schlicker, R. Vasquez, R. Wofford, Integer Sequences from Configurations in the Hausdorff Metric Geometry via Edge Covers of Bipartite Graphs. In preparation.


LINKS

Table of n, a(n) for n=4..18.


FORMULA

a(n) = 3*31^(n1)  11*15^(n1) + 15*7^(n1)  3^(n+1) + 2.


CROSSREFS

Sequences of segments from removing edges from bipartite graphs A335608A335613, A337416A337418, A340173A340175, A340199A340201, A340897A340899, A342580, A342796, A342850, A340403A340405, A340433A340438, A341551A341553, A342327A342328, A343372A343374, A343800. Polygonal chain sequences A152927, A152928, A152929, A152930, A152931, A152932, A152933, A152934, A152939. Number of {0,1} n X n matrices with no zero rows or columns A048291.
Sequence in context: A019290 A069335 A236152 * A352244 A233643 A166195
Adjacent sequences: A340431 A340432 A340433 * A340435 A340436 A340437


KEYWORD

easy,nonn


AUTHOR

Rachel Wofford, Jan 07 2021


STATUS

approved



