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 A130706 a(0) = 1, a(1) = 2, a(n) = 0 for n > 1. 9

%I

%S 1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N a(0) = 1, a(1) = 2, a(n) = 0 for n > 1.

%C Inverse binomial transform of A005408.

%C Decimal expansion of 3/25. - _Franklin T. Adams-Watters_, Mar 08 2019

%C 2^n mod 4. - _Charles R Greathouse IV_, Apr 30 2019

%F G.f.: 1 + 2*x.

%F a(n) = [C(2*n, n) mod 2] + 2*[C((n + 1)^2, n + 3) mod 2], n >= 0. - _Paolo P. Lava_, Oct 22 2007

%t RealDigits[12, 10, 100][[1]] (* _Alonso del Arte_, Sep 16 2016 *)

%o (PARI) .12 \\ _Charles R Greathouse IV_, Sep 16 2016

%K easy,nonn

%O 0,2

%A _Philippe DelĂ©ham_, Jun 27 2007

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Last modified December 9 22:27 EST 2019. Contains 329880 sequences. (Running on oeis4.)