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A282822 a(n) = (n - 4)*n! for n>=0. 2
-4, -3, -4, -6, 0, 120, 1440, 15120, 161280, 1814400, 21772800, 279417600, 3832012800, 56043187200, 871782912000, 14384418048000, 251073478656000, 4623936565248000, 89633231880192000, 1824676506132480000, 38926432130826240000, 868546016919060480000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..21.

FORMULA

E.g.f.: -(4 - 5*x)/(1 - x)^2.

a(n) = n*a(n-1) + n!, with n>0, a(0)=-4.

a(n) = 2*A034865(n) for n>3.

MATHEMATICA

Table[(n - 4) n!, {n, 0, 30}] (* or *)

RecurrenceTable[{a[0] == -4, a[n] == n a[n - 1] + n!}, a, {n, 0, 30}]

CROSSREFS

Cf. A034865.

Cf. sequences with formula (n + k)*n! listed in A282466.

Sequence in context: A132293 A205398 A135103 * A193694 A117893 A021701

Adjacent sequences:  A282819 A282820 A282821 * A282823 A282824 A282825

KEYWORD

sign,easy

AUTHOR

Bruno Berselli, Feb 22 2017

STATUS

approved

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Last modified June 24 17:58 EDT 2019. Contains 324330 sequences. (Running on oeis4.)