A004527 - OEIS

A004527

Ratios of successive terms are 1,2,2,3,4,4,5,6,6,...

1, 1, 2, 4, 12, 48, 192, 960, 5760, 34560, 241920, 1935360, 15482880, 139345920, 1393459200, 13934592000, 153280512000, 1839366144000, 22072393728000, 286941118464000, 4017175658496000, 56240459218944000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..480

MATHEMATICA

FoldList[Times, 1, Flatten[Append[#, Last[#]]&/@Partition[Range[20], 2]]] (* Harvey P. Dale, Oct 15 2011 *)

CROSSREFS

Sequence in context: A368814 A277281 A172452 * A002871 A013172 A321009

Adjacent sequences: A004524 A004525 A004526 * A004528 A004529 A004530

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved