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URL: https://oeis.org/A167559

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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
OFFSET
1,2
COMMENTS
Triangle A167557 is the lower left triangle of the ED1 array A167546.
LINKS
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: A058478 A367256 A159608 * A367154 A121631 A071214
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Nov 10 2009
STATUS
approved