login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167559 The row sums of triangle A167557. 2
1, 5, 46, 598, 10056, 207960, 5111856, 145721520, 4728528000, 172134253440, 6948393580800, 308058678385920, 14882061698380800, 778136819786726400, 43783908789625804800, 2638014817853286144000, 169455373956672285081600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Triangle A167557 is the lower left triangle of the ED1 array A167546.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..150

FORMULA

a(n) = Sum_{m=1..n} (4^(m-1)*(m-1)!*(n+m-2)!/(2*m-2)!).

MATHEMATICA

Table[Sum[4^(m - 1) *(m - 1)! * (n + m - 2)!/(2*m - 2)!, {m, 1, n}], {n, 1, 10}] (* G. C. Greubel, Jun 15 2016 *)

CROSSREFS

A167546 is the ED1 array.

Equals row sums of triangle A167557.

Sequence in context: A295544 A058478 A159608 * A121631 A071214 A052873

Adjacent sequences:  A167556 A167557 A167558 * A167560 A167561 A167562

KEYWORD

easy,nonn

AUTHOR

Johannes W. Meijer, Nov 10 2009

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 August 10 16:56 EDT 2020. Contains 336381 sequences. (Running on oeis4.)