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URL: https://oeis.org/A013823

⇱ A013823 - OEIS

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A013823
a(n) = 2^(5*n + 2).
4
4, 128, 4096, 131072, 4194304, 134217728, 4294967296, 137438953472, 4398046511104, 140737488355328, 4503599627370496, 144115188075855872, 4611686018427387904, 147573952589676412928, 4722366482869645213696, 151115727451828646838272, 4835703278458516698824704
OFFSET
0,1
FORMULA
From Philippe Deléham, Nov 24 2008: (Start)
a(n) = 32*a(n-1); a(0)=4.
G.f.: 4/(1-32*x).
a(n) = 4*A009976(n). (End)
From Elmo R. Oliveira, Feb 20 2025: (Start)
E.g.f.: 4*exp(32*x).
a(n) = A000079(A016873(n)). (End)
a(n) = 2*A013822(n) = A013824(n)/2. - Paolo Xausa, Feb 21 2025
MATHEMATICA
2^(5*Range[0, 20] + 2) (* Paolo Xausa, Feb 21 2025 *)
PROG
(Magma) [2^(5*n+2): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011
(Maxima) makelist(2^(5*n+2), n, 0, 20); /* Martin Ettl, Oct 21 2012 */
CROSSREFS
KEYWORD
nonn,easy
STATUS
approved