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A172806
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Number of n X n of nonnegative integers with all row and column sums equal to 4.
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3
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1, 1, 5, 120, 10147, 2224955, 1047649905, 936670590450, 1455918295922650, 3680232136895819610, 14356628851597700179050, 82857993930808028192521800, 683327637694741065563262206250, 7821620120684573354895941635688250
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OFFSET
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0,3
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 0..56
Esther M. Banaian, Generalized Eulerian Numbers and Multiplex Juggling Sequences, (2016). All College Thesis Program. Paper 24.
M. L. Stein and P. R. Stein, Enumeration of Linear Graphs and Connected Linear Graphs up to p = 18 Points. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967.
M. L. Stein and P. R. Stein, Enumeration of Stochastic Matrices with Integer Elements, Report LA-4434, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Jun 1970. [Annotated scanned copy]
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CROSSREFS
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Cf. A000681, A001500, A172862, A172894, A172919, A172944, A172958.
Column k=4 of A257493.
Sequence in context: A192639 A099123 A097993 * A054752 A258978 A128275
Adjacent sequences: A172803 A172804 A172805 * A172807 A172808 A172809
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Feb 06 2010
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STATUS
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approved
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