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%I #20 Dec 31 2023 10:16:53
%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.
%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 Deléham_, Jun 27 2007
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