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A074225 a(n) = n * Sum_{d|n} d*2^(d-1). 0
1, 10, 39, 148, 405, 1254, 3143, 8488, 20853, 52050, 123915, 297804, 692237, 1611974, 3687795, 8405584, 18939921, 42512562, 94634003, 209819940, 462431697, 1015269486, 2218786839, 4832458392, 10485762025, 22684180610, 48922424415, 105229923596 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

N. J. A. Sloane and Thomas Wieder, The Number of Hierarchical Orderings, Order 21 (2004), 83-89.

CROSSREFS

Equals n*A83413(n).

Sequence in context: A022277 A188480 A059722 * A055514 A055233 A189947

Adjacent sequences:  A074222 A074223 A074224 * A074226 A074227 A074228

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 15 2003

STATUS

approved

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Last modified May 18 09:19 EDT 2013. Contains 225419 sequences.