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A177882 Trisection of A001317. 5

%I

%S 1,15,85,771,4369,65535,327685,3342387,16843009,252645135,1431655765,

%T 12884901891,73014444049,1095216660735,5519032976645,56294136361779,

%U 281479271743489,4222189076152335,23925738098196565

%N Trisection of A001317.

%C For n>=1, all terms are in A001969.

%C Or rows of triangle A008287 mod 2 converted to decimal.

%H Gheorghe Coserea, <a href="/A177882/b177882.txt">Table of n, a(n) for n = 0..200</a>

%F a(n) = A001317(3*n).

%t f[n_] := BitXor[n, BitShiftLeft[n, 1]]; Table[Nest[f, 1, x], {x, 0, 54, 3}]

%o (PARI)

%o a(n) = subst(lift(Pol(Mod([1, 1, 1, 1], 2), 'x)^n), 'x, 2);

%o vector(19, n, a(n-1)) \\ _Gheorghe Coserea_, Jun 12 2016

%Y Cf. A008287, A005190, A007318, A001317

%K nonn

%O 0,2

%A _Vladimir Shevelev_, Dec 14 2010

%E Definition rewritten by _N. J. A. Sloane_, Jan 01 2011

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Last modified March 18 16:00 EDT 2019. Contains 321292 sequences. (Running on oeis4.)