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A002136 Matrices with 2 rows.
(Formerly M1668 N0656)
+0
1
1, 2, 6, 23, 109, 618, 4096, 31133, 267219, 2557502 (list; graph; listen)
OFFSET

3,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

P. A. MacMahon, Combinations derived from m identical sets of n different letters and their connexion with general magic squares, Proc. London Math. Soc., 17 (1917), 25-41.

CROSSREFS

Sequence in context: A071076 A112501 A093345 this_sequence A117226 A117156 A113229

Adjacent sequences: A002133 A002134 A002135 this_sequence A002137 A002138 A002139

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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