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A121945 a(n) is the sum of the first n factorials in decreasing powers from n to 1. a(n) = Sum_{k = 1..n} k!^(n-k+1). 0
1, 3, 11, 69, 929, 30273, 2591057, 614059329, 423463272449, 907403624202753, 6082394749206781697, 140440480114401911810049, 10845109029138237198786147329, 3088811811740393517911301490890753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

Table[Sum[Factorial[i]^(n - i + 1), {i, n}], {n, 20}]

CROSSREFS

Similar to A003101 = Sum_{k = 1..n} (n-k+1)^k - only with inserted factorials.

Sequence in context: A074504 A126115 A018193 * A009025 A009103 A018192

Adjacent sequences:  A121942 A121943 A121944 * A121946 A121947 A121948

KEYWORD

nonn

AUTHOR

Tanya Khovanova, Sep 03 2006

STATUS

approved

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Last modified June 29 01:29 EDT 2017. Contains 288855 sequences.