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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A131438 (2+n)*2^n-2-3*n. 3
 1, 8, 29, 82, 207, 492, 1129, 2534, 5603, 12256, 26589, 57306, 122839, 262100, 557009, 1179598, 2490315, 5242824, 11009989, 23068610, 48234431, 100663228, 209715129, 436207542, 905969587 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums of triangle A131437. LINKS Index entries for linear recurrences with constant coefficients, signature (6,-13,12,-4). FORMULA Binomial transform of A131439. G.f.: -x*(-1-2*x+6*x^2) / ( (2*x-1)^2*(x-1)^2 ). - R. J. Mathar, Sep 24 2011 EXAMPLE a(3) = 19 = sum of row 3 terms of triangle A131437: (7 + 9 + 13). CROSSREFS Cf. A131436, A131437, A131439. Sequence in context: A046664 A333510 A055536 * A048478 A001360 A294838 Adjacent sequences:  A131435 A131436 A131437 * A131439 A131440 A131441 KEYWORD nonn,easy AUTHOR Gary W. Adamson, Jul 11 2007 EXTENSIONS Definition replaced by formula. - R. J. Mathar, Sep 24 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.

Last modified June 21 04:10 EDT 2021. Contains 345354 sequences. (Running on oeis4.)