Search: id:A000506
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%I A000506 M5322 N2313
%S A000506 61,841,7311,51663,325446,1910706,10715506,58258210,309958755,
%T A000506 1623847695,8412276585,43220104041,220683627988,1121561317408,
%U A000506 5679711010548,28683869195556,144552802373145,727271783033445
%N A000506 One half of the number of permutations of [n] such that the differences 
               have 5 runs with the same signs.
%D A000506 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000506 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000506 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied 
               Tables, Cambridge, 1966, p. 260.
%D A000506 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 260, #13
%F A000506 16*a(n)/5^n ->1 as n ->infinity . - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), 
               Feb 22 2004
%Y A000506 A diagonal of A008970.
%Y A000506 Sequence in context: A086945 A142365 A093473 this_sequence A008358 A138790 
               A057534
%Y A000506 Adjacent sequences: A000503 A000504 A000505 this_sequence A000507 A000508 
               A000509
%K A000506 nonn,easy
%O A000506 6,1
%A A000506 N. J. A. Sloane (njas(AT)research.att.com).
%E A000506 More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 21 2004

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