login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A202067 Numerator of mass of oriented maximal Wicks forms of genus n. 3
1, 35, 5005, 8083075, 6506875375, 5849680962125, 23808201515848750, 272830085270868750625, 3141638431894053663446875, 31136778498501965858421978125, 387120736455647804975409688393750, 5900687825425211667337682175341734375 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

R. Bacher and A. Vdovina, Counting 1-vertex triangulations of oriented surfaces, Discrete Math. 246 (2002), 13-27.

EXAMPLE

1/6, 35/6, 5005/3, 8083075/6, 6506875375/3, 5849680962125, 23808201515848750, 272830085270868750625/2, 3141638431894053663446875/3, 31136778498501965858421978125/3, ...

MAPLE

m1:=g->2*(1/12)^g*(6*g-5)!/(g!*(3*g-3)!);

s1:=[seq(m1(g), g=1..50)]:

s1a:=[seq(numer(m1(g)), g=1..50)]; #A202067

s1b:=[seq(denom(m1(g)), g=1..50)]; #A202068

s2:=[seq(6*m1(g), g=1..20)]: #A202066

CROSSREFS

Sequence in context: A115963 A212024 A231914 * A336306 A202881 A210268

Adjacent sequences:  A202064 A202065 A202066 * A202068 A202069 A202070

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Dec 10 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 21 09:30 EDT 2022. Contains 353908 sequences. (Running on oeis4.)