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 A007462 Shifts left under XOR-convolution with itself. (Formerly M1274) 3
 0, 1, 2, 4, 14, 38, 118, 338, 1006, 2990, 8974, 26862, 80510, 241390, 723934, 2171046, 6512910, 19536974, 58608782, 175821710, 527470318, 1582385678, 4747139342, 14241362318, 42724100334, 128172182990, 384516408110, 1153548740206, 3460645850030, 10381936700110 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Alois P. Heinz, Table of n, a(n) for n = 0..1000 M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210. [Link to arXiv version] M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210. [Link to Lin. Alg. Applic. version together with omitted figures] FORMULA a(n) ~ c * 3^n, where c = 0.151273188266276362886260408769663538575624024971525940842364624... . - Vaclav Kotesovec, Sep 10 2014 MAPLE with(Bits): a:= proc(n) option remember;       `if`(n<2, n, add(Xor(a(i), a(n-1-i)), i=0..n-1))     end: seq(a(n), n=0..30);  # Alois P. Heinz, Jun 22 2012 MATHEMATICA a[0]=0; a[1]=1; a[n_] := a[n] = Sum[BitXor[a[k], a[n-k-1]], {k, 0, n-1}]; Table[a[n], {n, 0, 30}] (* Jean-François Alcover, Sep 07 2012, after Alois P. Heinz *) PROG (Haskell) import Data.Bits (xor) a007462 n = a007462_list !! n a007462_list = 0 : 1 : f [1, 0] where    f xs = y : f (y : xs) where      y = sum \$ zipWith xor xs \$ reverse xs :: Integer -- Reinhard Zumkeller, Jul 15 2012 CROSSREFS Cf. A192484, A199770. Sequence in context: A135960 A216630 A006611 * A053623 A035010 A055540 Adjacent sequences:  A007459 A007460 A007461 * A007463 A007464 A007465 KEYWORD nonn,nice,eigen AUTHOR STATUS approved

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