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A005460 (3n+4)(n+3)!/24.
(Formerly M4433)
+0
4
1, 7, 50, 390, 3360, 31920, 332640, 3780000, 46569600, 618710400, 8821612800, 134399865600, 2179457280000, 37486665216000, 681734237184000, 13071512982528000 (list; graph; listen)
OFFSET

0,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

R. K. Guy, personal communication.

LINKS

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

FORMULA

Expansion of (1+2x) / (1-x)^5.

Essentially Stirling numbers of second kind - see A028246.

CROSSREFS

Sequence in context: A081189 A108869 A065429 this_sequence A053155 A041086 A015495

Adjacent sequences: A005457 A005458 A005459 this_sequence A005461 A005462 A005463

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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