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 A095894 a(2n) = 6*n^2 + 7*n + 1; a(2n+1) = 6*n^2 + 13*n + 7. 2
 1, 7, 14, 26, 39, 57, 76, 100, 125, 155, 186, 222, 259, 301, 344, 392, 441, 495, 550, 610, 671, 737, 804, 876, 949, 1027, 1106, 1190, 1275, 1365, 1456, 1552, 1649, 1751, 1854, 1962, 2071, 2185, 2300, 2420, 2541, 2667, 2794, 2926, 3059, 3197, 3336, 3480 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS From Omar E. Pol, Jul 18 2012: (Start) Positive terms of A051866 and positive terms of A049453 interleaved. Also sequence found by reading the line from 1, in the direction 1, 14, ..., and the line from 7, in the direction 7, 26, ..., in the square spiral whose vertices are the generalized pentagonal numbers A001318. (End) LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (2,0,-2,1). FORMULA G.f.: ( -1-5*x ) / ( (1+x)*(x-1)^3 ). - R. J. Mathar, Oct 26 2011 MATHEMATICA LinearRecurrence[{2, 0, -2, 1}, {1, 7, 14, 26}, 60] (* Harvey P. Dale, Oct 13 2016 *) PROG (PARI) x='x+O('x^50); Vec((-1-5*x)/((1+x)*(x-1)^3)) \\ G. C. Greubel, Jun 19 2017 CROSSREFS Cf. A047225 (first differences), A049453, A051866. Sequence in context: A232871 A232854 A232790 * A104599 A115874 A083495 Adjacent sequences: A095891 A095892 A095893 * A095895 A095896 A095897 KEYWORD nonn,easy AUTHOR Gary W. Adamson, Jun 11 2004 EXTENSIONS Edited by Don Reble, Nov 16 2005 STATUS approved

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Last modified November 30 08:36 EST 2022. Contains 358438 sequences. (Running on oeis4.)