id:A121945 - OEIS Search Results

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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).

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1, 3, 11, 69, 929, 30273, 2591057, 614059329, 423463272449, 907403624202753, 6082394749206781697, 140440480114401911810049, 10845109029138237198786147329, 3088811811740393517911301490890753 (list; graph; listen)

	OFFSET	`1,2`
	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.` `Adjacent sequences: A121942 A121943 A121944 this_sequence A121946 A121947 A121948` `Sequence in context: A074504 A126115 A018193 this_sequence A009025 A009103 A018192`
	KEYWORD	`nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Sep 03 2006`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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