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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A100167 Structured pentagonal icositetrahedral numbers (vertex structure 13). 2
 1, 38, 171, 460, 965, 1746, 2863, 4376, 6345, 8830, 11891, 15588, 19981, 25130, 31095, 37936, 45713, 54486, 64315, 75260, 87381, 100738, 115391, 131400, 148825, 167726, 188163, 210196, 233885, 259290, 286471, 315488 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..5000 Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1). FORMULA a(n) = (1/6)*(60*n^3 - 72*n^2 + 18*n). G.f.: x*(1 + 34*x + 25*x^2)/(1-x)^4. - Colin Barker, Feb 14 2012 MATHEMATICA Table[(60n^3-72n^2+18n)/6, {n, 40}] (* or *) LinearRecurrence[{4, -6, 4, -1}, {1, 38, 171, 460}, 40] (* Harvey P. Dale, Aug 21 2016 *) PROG (Magma) [(1/6)*(60*n^3-72*n^2+18*n): n in [1..40]]; // Vincenzo Librandi, Jul 26 2011 CROSSREFS Cf. A100168 = alternate vertex; A100145 for more on structured numbers. Sequence in context: A135176 A318625 A281208 * A100168 A137022 A160064 Adjacent sequences: A100164 A100165 A100166 * A100168 A100169 A100170 KEYWORD easy,nonn AUTHOR James A. Record (james.record(AT)gmail.com), Nov 07 2004 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.

Last modified August 15 17:35 EDT 2024. Contains 375173 sequences. (Running on oeis4.)