The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A107028

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A107028

Row sums of number triangle A107027.
(history; published version)

#3 by Russ Cox at Fri Mar 30 18:59:07 EDT 2012

AUTHOR

_Paul Barry (pbarry(AT)wit.ie), _, May 09 2005

Discussion

Fri Mar 30

18:59

OEIS Server: https://oeis.org/edit/global/287

#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

FORMULA

a(n)=sum{k=0..n, (n-k-1)C((n-k)*k, k)-(n-k-2)*sum{j=0..k, C((n-k)*k, j)}}

KEYWORD

easy,nonn,new

#1 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

Row sums of number triangle A107027.

DATA

1, 3, 5, 9, 19, 49, 155, 591, 2651, 13689, 80009, 522193, 3762273, 29629483, 252966249, 2325176147, 22874076091, 239615657133, 2661015200515, 31207545002577, 385191232715737, 4988767088734625, 67615869255979521

OFFSET

0,2

FORMULA

a(n)=sum{k=0..n, (n-k-1)C((n-k)*k,k)-(n-k-2)*sum{j=0..k,C((n-k)*k,j)}}

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), May 09 2005

STATUS

approved