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 A167559 The row sums of triangle A167557. 2

%I

%S 1,5,46,598,10056,207960,5111856,145721520,4728528000,172134253440,

%T 6948393580800,308058678385920,14882061698380800,778136819786726400,

%U 43783908789625804800,2638014817853286144000,169455373956672285081600

%N The row sums of triangle A167557.

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

%H G. C. Greubel, <a href="/A167559/b167559.txt">Table of n, a(n) for n = 1..150</a>

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

%t 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 *)

%Y A167546 is the ED1 array.

%Y Equals row sums of triangle A167557.

%K easy,nonn

%O 1,2

%A _Johannes W. Meijer_, Nov 10 2009

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Last modified September 19 18:37 EDT 2020. Contains 337181 sequences. (Running on oeis4.)