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A067092 a(n) = floor(X/Y) where X = concatenation in decreasing order of (2n)-th even number to (n+1)-th even number and Y = that of first n even numbers in increasing order. 12
2, 3, 49, 6540, 8176, 9814, 11451, 13088, 14725, 16362, 17999, 19636, 21273, 22910, 24547, 26184, 27821, 29458, 31095, 32732, 34369, 36006, 37643, 39280, 40917, 4217902, 438013252, 45423626657, 4704592803725, 486682294165577 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

EXAMPLE

a(3) = floor[12108/246] = 49. a(8) = floor [ 3230282624222018/246810121416] = floor[13088.128662184629278356029087656] = 13088.

MATHEMATICA

Table[Floor[FromDigits[Flatten[IntegerDigits/@Range[4n, 2n+2, -2]]]/ FromDigits[ Flatten[IntegerDigits/@Range[2, 2n, 2]]]], {n, 30}] (* Harvey P. Dale, Mar 11 2019 *)

CROSSREFS

Cf. A067088, A067089, A067090, A067091.

Sequence in context: A118222 A191594 A208204 * A041133 A113700 A065646

Adjacent sequences:  A067089 A067090 A067091 * A067093 A067094 A067095

KEYWORD

easy,nonn,base

AUTHOR

Amarnath Murthy, Jan 07 2002

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 01 2003

Edited by Charles R Greathouse IV, Apr 23 2010

STATUS

approved

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Last modified January 22 22:16 EST 2020. Contains 331166 sequences. (Running on oeis4.)