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%I #11 Jan 23 2018 15:46:25
%S 1,4,32,392,6488,135360,3408120,100520432,3398723928
%N Number of pairs of length n permutations achievable by double-ended priority queue.
%D M. D. Atkinson and Robert Beals, Priority queues and permutations, SIAM J Comput., 23 (1994), 1225-12430.
%H Sean A. Irvine, <a href="/A007763/a007763.pdf">Notes on A007763</a>
%Y Cf. A000272 (single-ended priority queue).
%K nonn,more
%O 1,2
%A mda(AT)cs.st-andrews.ac.uk (Michael Atkinson)
%E Title improved and a(7)-a(9) from _Sean A. Irvine_, Jan 23 2018
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