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A317483
Circuit rank of the n-Bruhat graph.
1
0, 0, 1, 13, 121, 1081, 10081, 100801, 1088641, 12700801, 159667201, 2155507201, 31135104001, 479480601601, 7846046208001, 135998134272001, 2489811996672001, 48017802792960001, 973160803270656001, 20679667069501440001, 459818479545384960001, 10678006913887272960001
OFFSET
1,4
LINKS
Eric Weisstein's World of Mathematics, Bruhat Graph
Eric Weisstein's World of Mathematics, Circuit Rank
FORMULA
From Andrew Howroyd, Jul 30 2018: (Start)
a(n) = A001286(n) - A000142(n) + 1.
a(n) = (n-3)*n!/2 + 1. (End)
MATHEMATICA
Table[(n - 3) n!/2 + 1, {n, 20}] (* Eric W. Weisstein, May 10 2019 *)
PROG
(PARI) a(n)={n!*(n-1)\2 - n! + 1} \\ Andrew Howroyd, Jul 30 2018
CROSSREFS
Sequence in context: A081033 A091111 A196921 * A096053 A033470 A297594
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Jul 29 2018
EXTENSIONS
Terms a(7) and beyond from Andrew Howroyd, Jul 30 2018
STATUS
approved