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A001495
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Number of stochastic matrices of integers.
(Formerly M2947 N1188)
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0
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1, 1, 1, 3, 13, 70, 462, 3592, 32056, 322626, 3611890, 44491654, 597714474, 8693651092, 136059119332, 2279212812480, 40681707637888, 770631412413148
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| H. Gupta, Enumeration of symmetric matrices, Duke Math. J., 35 (1968), 653-659.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| It appears that E.g.f. = 1+int((1-t)^(-3/2)*exp( t*(t^2+3*t-2)/(4-4*t) ),t = 0..x) - Mark van Hoeij, Oct 25 2011.
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CROSSREFS
| Sequence in context: A154677 A121586 A024337 * A198447 A162326 A122455
Adjacent sequences: A001492 A001493 A001494 * A001496 A001497 A001498
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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