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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A162442 Denominators of the column sums of the EG1 matrix coefficients 3
 2, 16, 48, 512, 1280, 2048, 14336, 262144, 589824, 2621440, 5767168, 50331648, 109051904, 469762048, 67108864, 34359738368, 73014444032, 103079215104, 652835028992, 1099511627776, 3848290697216, 48378511622144 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS For the definition of the EG1 matrix coefficients see A162440. We define the columns sums by cs(n) = sum(EG1[2*m-1,n], m = 1.. infinity) for n => 2. LINKS Table of n, a(n) for n=2..23. FORMULA a(n) = denom(cs(n)) and numer(cs(n)) = A162441(n) with cs(n) = (2^(2-2*n)/(n-1))*((2*n-1)!/((n-1)!^2)). a(n) = denom((1/(n-1))*(2*n-1)*binomial(2*n-2,n-1)/4^(n-1)) CROSSREFS Equals A052469(n-1)/2 for n=>2. cs(n) = (1/(n-1))*A001803(n-1)/A046161(n-1) for n=>2. Cf. A162440 and A162441. Sequence in context: A220801 A220250 A192388 * A159010 A223219 A063721 Adjacent sequences: A162439 A162440 A162441 * A162443 A162444 A162445 KEYWORD easy,frac,nonn AUTHOR Johannes W. Meijer, Jul 06 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 19 04:40 EDT 2024. Contains 376004 sequences. (Running on oeis4.)