login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A127741 (n+1) * A005493(n). 2
1, 6, 30, 148, 755, 4044, 22841, 136056, 853452, 5625950, 38885297, 281170080, 2122313505, 16688829122, 136457754030, 1158155642512, 10186602918035, 92711977180164, 871936904575985, 8462913158427580, 84668764368102012, 872196382566014506, 9241557859113581689 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A127740 = (n+1) * each term in Aitkens' triangle, A011971. A127741 = row sums of A127740.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..250

FORMULA

(n+1) * A005493(n), where A005493 = row sums of Aitkens' triangle: (1, 3, 10, 37,...); i.e. 1*1, 2*3, 3*10, 4*37,... Row sums of A127740

EXAMPLE

a(n) = sum of terms in n-th row of A127740. a(2) = 30 = (6 + 9 + 115).

PROG

(Python)

# requires python 3.2 or higher. Otherwise use def'n of accumulate in python docs.

from itertools import accumulate

A127741_list, blist, b = [], [1], 1

for n in range(1, 1001):

....blist = list(accumulate([b]+blist))

....b = blist[-1]

....A127741_list.append(blist[-2]*n) # Chai Wah Wu, Sep 20 2014

CROSSREFS

Cf. A000110, A052889, A011971, A127740.

Sequence in context: A006320 A319377 A079738 * A073965 A214940 A002913

Adjacent sequences:  A127738 A127739 A127740 * A127742 A127743 A127744

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Jan 27 2007

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 12:01 EDT 2019. Contains 322429 sequences. (Running on oeis4.)