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A060918 E.g.f.: exp((-1)^k/k*LambertW(-x)^k)/(k-1)!, k=4. 2
1, 20, 360, 6860, 143570, 3321864, 84756000, 2372001720, 72384192540, 2394775746220, 85443353291296, 3271908306712500, 133893717061821080, 5832748749666611920, 269542701201588099840, 13172225935626444660144 (list; graph; refs; listen; history; internal format)
OFFSET

4,2

FORMULA

a(n)=(n-1)!/(k-1)!*Sum_{i=0..floor((n-k)/k)} 1/(i!*k^i)*n^(n-(i+1)*k)/(n-(i+1)*k)!, k=4.

CROSSREFS

Cf. A057817, A060917.

Sequence in context: A089350 A004292 A053508 * A115100 A049683 A014901

Adjacent sequences:  A060915 A060916 A060917 * A060919 A060920 A060921

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2001

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Last modified February 13 19:52 EST 2012. Contains 205536 sequences.