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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A193872 Even dodecagonal numbers: 4*n*(5*n - 2). 3
 0, 12, 64, 156, 288, 460, 672, 924, 1216, 1548, 1920, 2332, 2784, 3276, 3808, 4380, 4992, 5644, 6336, 7068, 7840, 8652, 9504, 10396, 11328, 12300, 13312, 14364, 15456, 16588, 17760, 18972, 20224, 21516, 22848, 24220, 25632, 27084, 28576, 30108, 31680 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Even 12-gonal numbers. Bisection of A051624. LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 4*A147874(n+1). a(n) = 4*n*A016885(n-1), n >= 1. MATHEMATICA PolygonalNumber[12, 2*Range[0, 40]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 02 2017 *) PROG (PARI) a(n)=4*n*(5*n-2) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A016885, A051624, A147874. Sequence in context: A008425 A154507 A105916 * A258617 A307061 A074359 Adjacent sequences: A193869 A193870 A193871 * A193873 A193874 A193875 KEYWORD nonn,easy AUTHOR Omar E. Pol, Aug 19 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.

Last modified December 4 16:41 EST 2022. Contains 358563 sequences. (Running on oeis4.)