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!)
 A086795 a(n) is the number of terms in the expansion of (x-2y)*(x^2-2y^2)*(x^3-2y^3)*...*(x^n-2y^n). 4
 2, 4, 7, 11, 13, 21, 28, 35, 42, 53, 65, 74, 87, 102, 117, 133, 150, 168, 188, 207, 228, 251, 273, 298, 323, 348, 375, 404, 433, 463, 494, 526, 559, 592, 627, 664, 701, 739, 778, 817, 858, 901, 944, 988, 1032, 1079, 1126, 1174, 1222, 1273 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MAPLE A086795 := proc(n)     mul( x^i-2*y^i, i=1..n) ;     expand(%) ;     nops([coeffs(%)]) ; end proc: # R. J. Mathar, Sep 15 2012 CROSSREFS Cf. A086781. Sequence in context: A165288 A327572 A177754 * A064690 A138766 A192638 Adjacent sequences:  A086792 A086793 A086794 * A086796 A086797 A086798 KEYWORD nonn AUTHOR Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 05 2003 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 April 9 06:32 EDT 2020. Contains 333343 sequences. (Running on oeis4.)