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A003745 Number of spanning trees in (K_5 - e) X P_n. 1
75, 128625, 199065600, 307147367625, 473862674071875, 731065883885568000, 1127873690900648512275, 1740060755637940344737625, 2684530596730102104276172800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

F. Faase, On the number of specific spanning subgraphs of the graphs G X P_n, Ars Combin. 49 (1998), 129-154.

LINKS

P. Raff, Table of n, a(n) for n = 1..200

F. Faase, On the number of specific spanning subgraphs of the graphs G X P_n, Preliminary version of paper that appeared in Ars Combin. 49 (1998), 129-154.

F. Faase, Counting Hamilton cycles in product graphs

F. Faase, Results from the counting program

P. Raff, Spanning Trees in Grid Graphs.

P. Raff, Analysis of the Number of Spanning Trees of G x P_n, where G = {{1, 2}, {1, 3}, {1, 4}, {1, 5}, {2, 3}, {2, 4}, {2, 5}, {3, 4}}. Contains sequence, recurrence, generating function, and more.

P. Raff, Analysis of the Number of Spanning Trees of Grid Graphs.

FORMULA

a(n) = 1645*a(n-1) - 160129*a(n-2) + 3747310*a(n-3) - 7579606*a(n-4) + 3747310*a(n-5) - 160129*a(n-6) + 1645*a(n-7) - a(n-8). - Modified by Paul Raff, Oct 29 2009

G.f.: -75x(x^6 + 70x^5 - 6838x^4 + 6838x^2 - 70x - 1)/(x^8 - 1645x^7 + 160129x^6 - 3747310x^5 + 7579606x^4 - 3747310x^3 + 160129x^2 - 1645x + 1). - Paul Raff, Oct 29 2009

a(n) = 75*A001906(n)*(A004187(n))^3 [R. K. Guy, via seqfan list, Mar 28 2009]. - R. J. Mathar, Jun 03 2009

CROSSREFS

Sequence in context: A263064 A085404 A110100 * A068942 A116234 A065669

Adjacent sequences:  A003742 A003743 A003744 * A003746 A003747 A003748

KEYWORD

nonn

AUTHOR

Frans J. Faase

EXTENSIONS

Added recurrence from Faase's web page. - N. J. A. Sloane, Feb 03 2009

STATUS

approved

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Last modified November 19 01:43 EST 2017. Contains 294912 sequences.