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%I #20 Jun 12 2022 06:44:30
%S 2,4,9,19,39,79,159,319,639,1279,2559,5119,10239,20479,40959,81919,
%T 163839,327679,655359,1310719,2621439,5242879,10485759,20971519,
%U 41943039,83886079,167772159,335544319,671088639,1342177279
%N a(n) = T(n,1), array T as in A054134.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2).
%F For n > 2, a(n) = 10*A000225(n-3) + 9 = 10*(2^(n-3) - 1) + 9 = 10*2^(n-3) - 1. - _Gerald McGarvey_, Aug 25 2004
%F a(1)=1, a(n) = n + Sum_{i=1..n-1} a(i) for n > 1. - _Gerald McGarvey_, Sep 06 2004
%F a(n) = 5*2^(n-2) - 1 for n > 1. - _Karl V. Keller, Jr._, Jun 12 2022
%o (Python) print([2]+[(5*2**(n-2) - 1) for n in range(2, 50)]) # _Karl V. Keller, Jr._, Jun 12 2022
%Y Identical to A052549 except for initial term.
%Y Cf. A267524.
%K nonn
%O 1,1
%A _Clark Kimberling_
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