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 A001811 Coefficients of Laguerre polynomials. (Formerly M5185 N2253) 4
 1, 25, 450, 7350, 117600, 1905120, 31752000, 548856000, 9879408000, 185513328000, 3636061228800, 74373979680000, 1586644899840000, 35272336619520000, 816302647480320000, 19645683716026368000, 491142092900659200000, 12740803704070041600000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,2 REFERENCES M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 799. C. Lanczos, Applied Analysis. Prentice-Hall, Englewood Cliffs, NJ, 1956, p. 519. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS T. D. Noe, Table of n, a(n) for n = 4..100 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. C. Lanczos, Applied Analysis (Annotated scans of selected pages) FORMULA a(n) = n!*n*(n-1)(n-2)(n-3)/(4!)^2. a(4)=1, a(n+1)=a(n) * (n+1)^2 / (n-3). a(n)=A021009(n, 4), n >= 4. E.g.f.: x^4/(4!*(1-x)^5). If we define f(n,i,x)= sum(sum(binomial(k,j)*stirling1(n,k)*stirling2(j,i)*x^(k-j),j=i..k),k=i..n) then a(n)=(-1)^n*f(n,4,-5), (n>=4). - Milan Janjic, Mar 01 2009 EXAMPLE G.f. = x^4 + 25*x^5 + 450*x^6 + 7350*x^7 + 117600*x^8 + 1905120*x^9 + ... MAPLE with(combstruct):ZL:=[st, {st=Prod(left, right), left=Set(U, card=r+2), right=Set(U, card=1)}, labeled]: subs(r=2, stack): seq(count(subs(r=2, ZL), size=m), m=4..19) ; # Zerinvary Lajos, Feb 07 2008 MATHEMATICA Table[n! n (n - 1) (n - 2) (n - 3)/(4!)^2, {n, 4, 20}] (* T. D. Noe, Aug 10 2012 *) PROG (Sage) [factorial(m)*binomial(m, 4)/24 for m in xrange (4, 19)] # Zerinvary Lajos, Jul 05 2008 CROSSREFS Cf. A053495. Sequence in context: A260854 A001714 A016633 * A131279 A056069 A089386 Adjacent sequences:  A001808 A001809 A001810 * A001812 A001813 A001814 KEYWORD nonn,easy AUTHOR EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), Feb 07 2001 Corrected by T. D. Noe, Aug 10 2012 STATUS approved

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Last modified August 18 06:41 EDT 2018. Contains 313823 sequences. (Running on oeis4.)