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A011818 Normalized volume of center slice of n-dimensional cube: 2^n * n! * Vol({ x\in [ 0,1 ]: sum_{i=1}^n n/2 <= x_i <= (n+1)/2 }). 1
1, 3, 16, 115, 1056, 11774, 154624, 2337507, 39984640, 763546234, 16101629952, 371644257582, 9319104528384, 252270887452380, 7332475985461248, 227761317947788323, 7529455986838732800, 263948439074152148450 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

FORMULA

V(d) = sum_{k=1}^{d-1} {d choose k-1} A_{d, k} where A_{k, d} denotes the Eulerian number (permutations of a d-set with k-1 descents) - see A008292.

Restated: a(n) = Sum_{k=1..n} C(n,k-1)*A008292(n,k) for n>=1.

CROSSREFS

Cf. A104098, A008292.

Sequence in context: A211210 A177402 A036244 * A036248 A111555 A221409

Adjacent sequences:  A011815 A011816 A011817 * A011819 A011820 A011821

KEYWORD

nonn

AUTHOR

Guenter M. Ziegler (ziegler(AT)math.tu-berlin.de)

EXTENSIONS

More terms from Paul Hanna, Mar 15 2006

STATUS

approved

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Last modified June 19 09:12 EDT 2013. Contains 226401 sequences.