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 A292123 E.g.f. C(x) satisfies: C'(x) = A(x)*B(x) such that C(x)^2 - A(x)^2 = 8 and C(x)^2 - B(x)^2 = 5, where A(x) and B(x) are the e.g.f.s of A292121 and A292122, respectively. 5
 3, 2, 15, 82, 759, 6698, 83355, 1111018, 17804811, 311922962, 6167999175, 132938646082, 3142313821119, 80223941595578, 2209482997765395, 65134627503574618, 2049303263312162451, 68484112629314107682, 2423689374810702823935, 90531454062326770264882, 3559791311479931284873479, 146968393568442835837277258, 6356752152236511568747181835, 287439789050158514775171177418, 13562654176000911126785202632091 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Paul D. Hanna, Table of n, a(n) for n = 0..300 FORMULA E.g.f. C(x) and related functions A(x) and B(x) satisfy: (1a) A(x) = 1 + Integral B(x)*C(x) dx. (1b) B(x) = 2 + Integral A(x)*C(x) dx. (1c) C(x) = 3 + Integral A(x)*B(x) dx. (2a) B(x)^2 - A(x)^2 = 3. (2b) C(x)^2 - A(x)^2 = 8. (2c) C(x)^2 - B(x)^2 = 5. (3a) A(x) = (B'(x) + C'(x))/(B(x) + C(x)). (3b) B(x) = (C'(x) + A'(x))/(C(x) + A(x)). (3c) C(x) = (A'(x) + B'(x))/(A(x) + B(x)). (4a) A(x) + B(x) = 3 * exp( Integral C(x) dx ). (4b) A(x) + C(x) = 4 * exp( Integral B(x) dx ). (4c) B(x) + C(x) = 5 * exp( Integral A(x) dx ). (5a) A(x) = (-5*exp(Integral A(x) dx) + 4*exp(Integral B(x) dx) + 3*exp(Integral C(x) dx))/2. (5b) B(x) = (5*exp(Integral A(x) dx) - 4*exp(Integral B(x) dx) + 3*exp(Integral C(x) dx))/2. (5c) C(x) = (5*exp(Integral A(x) dx) + 4*exp(Integral B(x) dx) - 3*exp(Integral C(x) dx))/2. (6a) A(x)^m = 1 + Integral m * A(x)^(m-1) * B(x) * C(x) dx. (6b) B(x)^m = 2^m + Integral m * A(x) * B(x)^(m-1) * C(x) dx. (6c) C(x)^m = 3^m + Integral m * A(x) * B(x) * C(x)^(m-1) dx. EXAMPLE E.g.f. C(x) = 3 + 2*x + 15*x^2/2! + 82*x^3/3! + 759*x^4/4! + 6698*x^5/5! + 83355*x^6/6! + 1111018*x^7/7! + 17804811*x^8/8! + 311922962*x^9/9! + 6167999175*x^10/10! +... Related series. A(x) = 1 + 6*x + 13*x^2/2! + 102*x^3/3! + 653*x^4/4! + 7134*x^5/5! + 80257*x^6/6! + 1138638*x^7/7! + 17577977*x^8/8! + 314204406*x^9/9! + 6141247573*x^10/10! +... where C(x)^2 - A(x)^2 = 8. B(x) = 2 + 3*x + 20*x^2/2! + 78*x^3/3! + 736*x^4/4! + 6672*x^5/5! + 83360*x^6/6! + 1113072*x^7/7! + 17810944*x^8/8! + 311847168*x^9/9! + 6167567360*x^10/10! +... where C(x)^2 - B(x)^2 = 5. A(x) + B(x) = 3 + 9*x + 33*x^2/2! + 180*x^3/3! + 1389*x^4/4! + 13806*x^5/5! + 163617*x^6/6! + 2251710*x^7/7! + 35388921*x^8/8! + 626051574*x^9/9! + 12308814933*x^10/10! +... where A(x) + B(x) =  (A'(x) + B'(x)) / C(x). A(x) + C(x) = 4 + 8*x + 28*x^2/2! + 184*x^3/3! + 1412*x^4/4! + 13832*x^5/5! + 163612*x^6/6! + 2249656*x^7/7! + 35382788*x^8/8! + 626127368*x^9/9! + 12309246748*x^10/10! +... where A(x) + C(x) =  (A'(x) + C'(x)) / B(x). B(x) + C(x) = 5 + 5*x + 35*x^2/2! + 160*x^3/3! + 1495*x^4/4! + 13370*x^5/5! + 166715*x^6/6! + 2224090*x^7/7! + 35615755*x^8/8! + 623770130*x^9/9! + 12335566535*x^10/10! +... where B(x) + C(x) =  (B'(x) + C'(x)) / A(x). PROG (PARI) {a(n) = my(A=1, B=2, C=3); for(i=0, n, A = 1 + intformal(B*C +x*O(x^n)); B = 2 + intformal(A*C); C = 3 + intformal(A*B)); n!*polcoeff(C, n)} for(n=0, 30, print1(a(n), ", ")) CROSSREFS Cf. A292120 (A+B+C), A292121 (A), A292122 (B), A292124 (A*B*C). Sequence in context: A286947 A190961 A126323 * A084886 A275463 A304989 Adjacent sequences:  A292120 A292121 A292122 * A292124 A292125 A292126 KEYWORD nonn AUTHOR Paul D. Hanna, Sep 08 2017 STATUS approved

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Last modified July 21 00:39 EDT 2019. Contains 325189 sequences. (Running on oeis4.)