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A055861
Essentially A053506 but with leading 0 (instead of 1) and offset 0.
2
0, 0, 6, 48, 500, 6480, 100842, 1835008, 38263752, 900000000, 23579476910, 681091006464, 21505924728444, 737020860878848, 27246730957031250, 1080863910568919040, 45798768824157052688, 2064472028642102280192
OFFSET
0,3
FORMULA
a(0) = 0 = a(1); a(n) = n*(n+1)^(n-1), n >= 2.
E.g.f.: -x + W(-x)^2/((1+W(-x))*x) = ((d/dx)W(-x)^2)/2-x, W(x) principal branch of Lambert's function.
CROSSREFS
Third column of triangle A055858.
Sequence in context: A052639 A248744 A261900 * A053506 A052567 A351340
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Jun 20 2000
STATUS
approved