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 A096046 a(n) = B(2n,3)/B(2n) (see comment). 11
 1, 15, 141, 1275, 11481, 103335, 930021, 8370195, 75331761, 677985855, 6101872701, 54916854315, 494251688841, 4448265199575, 40034386796181, 360309481165635, 3242785330490721, 29185067974416495, 262665611769748461 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS B(n,p) = Sum_{i=0..n} p^i*Sum_{j=0..i} binomial(n,j)*B(j) where B(k) = k-th Bernoulli number. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 FORMULA a(n) = (1/4)*(7*9^n - 3). a(n) = 10*a(n-1) - 9*a(n-2); a(0)=1, a(1)=15. a(n) = 9*a(n-1) + 6. First differences = 14*A001019(n). - Paul Curtz, Jul 07 2008 PROG (PARI) a(n)=sum(i=0, 2*n, 3^i*sum(j=0, i, binomial(2*n, j)*bernfrac(j)))/bernfrac(2*n) (MAGMA) [(1/4)*(7*9^n-3): n in [0..30]]; // Vincenzo Librandi, Aug 13 2011 (Maxima) A096046(n):=(1/4)*(7*9^n-3)\$ makelist(A096046(n), n, 0, 30); /* Martin Ettl, Nov 13 2012 */ CROSSREFS Cf. A096045, A096047, A096048. Sequence in context: A055903 A320818 A026859 * A093117 A045724 A241402 Adjacent sequences:  A096043 A096044 A096045 * A096047 A096048 A096049 KEYWORD nonn AUTHOR Benoit Cloitre, Jun 17 2004 STATUS approved

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Last modified June 21 16:46 EDT 2021. Contains 345365 sequences. (Running on oeis4.)