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A005460 a(n) = (3*n+4)*(n+3)!/24.
(Formerly M4433)
4
1, 7, 50, 390, 3360, 31920, 332640, 3780000, 46569600, 618710400, 8821612800, 134399865600, 2179457280000, 37486665216000, 681734237184000, 13071512982528000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Essentially Stirling numbers of second kind - third external diagonal of Worpitzky triangle A028246.

REFERENCES

R. Austin, R. K. Guy, and R. Nowakowski, unpublished notes, circa 1987.

R. K. Guy, personal communication.

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

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..300

R. Austin, R. K. Guy, & R. Nowakowski, Unpublished notes, 1987

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

FORMULA

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

a(n)= S2(n+3, n+1)*n! - Olivier Gérard, Sep 13 2016

MATHEMATICA

Table[StirlingS2[n + 3, n + 1]*n!, {n, 0, 20}]

PROG

(MAGMA) [(3*n+4)*Factorial(n+3)/24: n in [0..20]]; // Vincenzo Librandi, Oct 08 2011

(PARI) a(n)=(3*n+4)*(n+3)!/24 \\ Charles R Greathouse IV, Jun 30 2017

CROSSREFS

Cf. A028246.

Sequence in context: A081189 A108869 A065429 * A053155 A266432 A267243

Adjacent sequences:  A005457 A005458 A005459 * A005461 A005462 A005463

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 17 16:51 EDT 2017. Contains 290648 sequences.