A127741 a(n) = (n+1) * A005493(n).

1, 6, 30, 148, 755, 4044, 22841, 136056, 853452, 5625950, 38885297, 281170080, 2122313505, 16688829122, 136457754030, 1158155642512, 10186602918035, 92711977180164, 871936904575985, 8462913158427580, 84668764368102012, 872196382566014506, 9241557859113581689

Offset

0,2

Comments

A127740 = (n+1) * each term in Aitken's triangle, A011971.

A127741 = row sums of A127740.

Links

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

Formula

a(n) = (n+1) * A005493(n), where A005493 = row sums of Aitken's 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 + 15).

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

Extensions

Edited by Jon E. Schoenfield, May 27 2019

Status

approved