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!)
 A004529 Ratios of successive terms are 1,1,1,2,3,3,3,4,5,5,5,6,... 2
 1, 1, 1, 1, 2, 6, 18, 54, 216, 1080, 5400, 27000, 162000, 1134000, 7938000, 55566000, 444528000, 4000752000, 36006768000, 324060912000, 3240609120000, 35646700320000, 392113703520000, 4313250738720000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Robert Israel, Table of n, a(n) for n = 0..506 FORMULA a(n) = Product_{j=0..n-1} (A180969(2,j+1) + A180969(2,j) + 1) = a(n-1) * (A180969(2,n-1) + A180969(2,n-2) + 1). - Adriano Caroli, Nov 27 2010 a(4*k+j) = 16^k * k! * Gamma(k+1/2)^3*(2*k+1)^j/Gamma(1/2)^3 for 0 <= j <= 3. - Robert Israel, Jun 19 2018 MAPLE seq(seq(16^k * k! * GAMMA(k+1/2)^3*(2*k+1)^j/GAMMA(1/2)^3, j=0..3), k=0..10); # Robert Israel, Jun 19 2018 CROSSREFS Sequence in context: A275872 A148455 A094590 * A238236 A294159 A000778 Adjacent sequences:  A004526 A004527 A004528 * A004530 A004531 A004532 KEYWORD nonn AUTHOR 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 6 11:14 EDT 2020. Contains 334827 sequences. (Running on oeis4.)