login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197988 Number of isomorphism classes of nanocones with 3 pentagons and a symmetric boundary of length n 7
1, 3, 5, 12, 18, 31, 44, 67, 88, 124, 157, 207, 255, 323, 387, 476, 560, 671, 778, 915, 1046, 1212, 1371, 1567, 1757, 1987, 2209, 2476, 2734, 3039, 3336, 3683, 4020, 4412, 4793, 5231, 5659, 6147, 6623, 7164, 7692, 8287, 8870, 9523, 10162, 10876, 11575, 12351 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

G. Brinkmann and N. Van Cleemput, Classification and generation of nanocones, Discrete Applied Mathematics, 159 (2011), 1528-1539.

LINKS

Nico Van Cleemput, Table of n, a(n) for n = 1..75

FORMULA

Conjectured g.f.: (x^7 + x^5 + x^4 + 2*x^3 + 2*x + 1)*x/((x - 1)^4*(x + 1)^2*(x^2 + x + 1)).  [D. S. McNeil, Oct 20 2011]

CROSSREFS

Sequence in context: A226652 A024696 A295360 * A025088 A279784 A198301

Adjacent sequences:  A197985 A197986 A197987 * A197989 A197990 A197991

KEYWORD

nonn

AUTHOR

Nico Van Cleemput, Oct 20 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 21 18:48 EST 2021. Contains 340352 sequences. (Running on oeis4.)