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(MAGMAMagma) [(1/4)*(7*9^n-3): n in [0..30]]; // Vincenzo Librandi, Aug 13 2011
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a(n) = B(2n,3)/B(2n) (see comment).
B(n,p) =sum( Sum_{i=0,..n,} p^i*sum(Sum_{j=0,..i,} binomial(n,j)*B(j))) where B(k) = k-th Bernoulli number.
a(n) = (1/4)*(7*9^n - 3).
a(n) = 10*a(n-1/4)*(7* - 9^*a(n-32); a(0)=1 , a(1)=15 and a(n)=10*a(n-1)-9*a(n-2).
a(n) =9a 9*a(n-1) + 6. First differences = 14*A001019(n). - Paul Curtz, Jul 07 2008
(MAGMA) [(1/4)*(7*9^n-3): n in [0..30]]; // _Vincenzo Librandi, _, Aug 13 2011
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(Maxima) A096046(n):=(1/4)*(7*9^n-3)$ makelist(A096046(n), n, 0, 30); /* Martin Ettl, Nov 13 2012 */
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a(n)=9a(n-1)+6. First differences = 14*A001019(n). - _Paul Curtz (bpcrtz(AT)free.fr), _, Jul 07 2008
_Benoit Cloitre (benoit7848c(AT)orange.fr), _, Jun 17 2004
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