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A209248
a(n) = 2^(2^n - 2*n - 1).
0
2, 128, 2097152, 2251799813685248, 10384593717069655257060992658440192, 883423532389192164791648750371459257913741948437809479060803100646309888
OFFSET
3,1
COMMENTS
a(n) = 2^A070313(n). Krotov on p. 2: "in general, two extended Hamming codes can intersect in 2^(2^m - 2m - 1) elements."
EXAMPLE
a(5) = 2^(2^5 - 2*5 - 1) = 2^21 = 2097152.
MATHEMATICA
Table[2^(2^n - 2n - 1), {n, 3, 15}] (* Alonso del Arte, Jan 13 2013 *)
PROG
(PARI) 1<<(2^n-2*n-1) \\ Charles R Greathouse IV, Jan 24 2013
(Maxima) makelist(floor(2^(2^n-2*n-1)), n, 3, 8); /* Martin Ettl, Jan 25 2013 */
CROSSREFS
Cf. A070313.
Sequence in context: A024345 A012524 A012670 * A153425 A296060 A090121
KEYWORD
nonn,easy
AUTHOR
Jonathan Vos Post, Jan 13 2013
STATUS
approved