The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A333734 Number of non-isomorphic n X n nonnegative integer matrices with all row and column sums equal to n up to permutations of rows and columns. 1
 1, 1, 2, 5, 43, 1856, 1217727, 8597641912, 646296747486387, 535435113671568180963, 5081029530811947425598907884 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..10. EXAMPLE The a(2) = 2 matrices are: [1 1] [2 0] [1 1] [0 2] . The a(3) = 5 matrices are: [1 1 1] [2 1 0] [2 1 0] [3 0 0] [3 0 0] [1 1 1] [1 1 1] [0 2 1] [0 2 1] [0 3 0] [1 1 1] [0 1 2] [1 0 2] [0 1 2] [0 0 3] CROSSREFS Main diagonal of A333733. Cf. A110058. Sequence in context: A286871 A027730 A225724 * A163115 A221682 A366406 Adjacent sequences: A333731 A333732 A333733 * A333735 A333736 A333737 KEYWORD nonn,more AUTHOR Andrew Howroyd, Apr 04 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 29 21:35 EST 2024. Contains 370428 sequences. (Running on oeis4.)