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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

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

Cf. A000142, A001286.

Sequence in context: A081033 A091111 A196921 * A096053 A033470 A297594

Adjacent sequences:  A317480 A317481 A317482 * A317484 A317485 A317486

KEYWORD

nonn,easy

AUTHOR

Eric W. Weisstein, Jul 29 2018

EXTENSIONS

Terms a(7) and beyond from Andrew Howroyd, Jul 30 2018

STATUS

approved

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Last modified October 20 21:32 EDT 2020. Contains 337910 sequences. (Running on oeis4.)