This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A103365 First column of triangle A103364, which equals the matrix inverse of the Narayana triangle (A001263). 10
 1, -1, 2, -7, 39, -321, 3681, -56197, 1102571, -27036487, 810263398, -29139230033, 1238451463261, -61408179368043, 3513348386222286, -229724924077987509, 17023649385410772579, -1419220037471837658603, 132236541042728184852942, -13690229149108218523467549 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS G. C. Greubel, Table of n, a(n) for n = 1..250 FORMULA From Paul D. Hanna, Jan 31 2009: (Start) G.f.: A(x) = 1/B(x) where A(x) = Sum_{n>=0} (-1)^n*a(n)*x^n/[n!*(n+1)!/2^n] and B(x) = Sum_{n>=0} x^n/[n!*(n+1)!/2^n]. G.f. satisfies: A(x) = 1/F(x*A(x)) and F(x) = 1/A(x*F(x)) where F(x) = Sum_{n>=0} A155926(n)*x^n/[n!*(n+1)!/2^n]. G.f. satisfies: A(x) = 1/G(x/A(x)) and G(x) = 1/A(x/G(x)) where G(x) = Sum_{n>=0} A155927(n)*x^n/[n!*(n+1)!/2^n]. (End) a(n) ~ (-1)^(n+1) * c * n! * (n-1)! * d^n, where d = 4/BesselJZero[1, 1]^2 = 0.2724429913055159309179376055957891881897555639652..., and c = 9.11336321311226744479181866135367355200240221549667284076... = BesselJZero[1, 1]^2 / (4*BesselJ[2, BesselJZero[1, 1]]). - Vaclav Kotesovec, Mar 01 2014, updated Apr 01 2018 EXAMPLE From Paul D. Hanna, Jan 31 2009: (Start) G.f.: A(x) = 1 - x + 2*x^2/3 - 7*x^3/18 + 39*x^4/180 - 321*x^5/2700 +... G.f.: A(x) = 1/B(x) where: B(x) = 1 + x + x^2/3 + x^3/18 + x^4/180 + x^5/2700 +...+ x^n/[n!*(n+1)!/2^n] +... (End) MATHEMATICA Table[(-1)^((n-1)/2) * (CoefficientList[Series[x/BesselJ[1, 2*x], {x, 0, 40}], x])[[n]] * ((n+1)/2)! * ((n-1)/2)!, {n, 1, 41, 2}] (* Vaclav Kotesovec, Mar 01 2014 *) PROG (PARI) a(n)=if(n<1, 0, (matrix(n, n, m, j, binomial(m-1, j-1)*binomial(m, j-1)/j)^-1)[n, 1]) (PARI) {a(n)=local(B=sum(k=0, n, x^k/(k!*(k+1)!/2^k))+x*O(x^n)); polcoeff(1/B, n)*n!*(n+1)!/2^n} \\ Paul D. Hanna, Jan 31 2009 CROSSREFS Cf. A001263, A103364, A103366, A103367. Cf. A155926, A155927. [Paul D. Hanna, Jan 31 2009] Cf. A238390, A180874, A115369. Sequence in context: A322152 A187806 A300519 * A145086 A052443 A153744 Adjacent sequences:  A103362 A103363 A103364 * A103366 A103367 A103368 KEYWORD sign AUTHOR Paul D. Hanna, Feb 02 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 21 10:03 EDT 2019. Contains 322328 sequences. (Running on oeis4.)