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A083327 a(n) = (5^n - 4^n + 3^n - 2^n)/2. 1

%I #11 Jan 05 2021 21:33:00

%S 0,1,7,40,217,1156,6097,31900,165697,855076,4387537,22404460,

%T 113945377,577590196,2919923377,14729076220,74167952257,372944296516,

%U 1873182473617,9399885079180,47135702874337,236224784974036

%N a(n) = (5^n - 4^n + 3^n - 2^n)/2.

%C Binomial transform of A053154 (with leading zero).

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (14,-71,154,-120).

%F G.f.: x(1-7x+13x^2)/((1-2x)(1-3x)(1-4x)(1-5x)).

%F E.g.f.: exp(5x) - exp(4x) + exp(3x) - exp(2x).

%F a(n) = 14*a(n-1) - 71*a(n-2) + 154*a(n-3) - 120*a(n-4), n > 3. - _Harvey P. Dale_, Apr 04 2013

%t Table[(5^n-4^n+3^n-2^n)/2,{n,0,30}] (* or *) LinearRecurrence[{14,-71,154,-120},{0,1,7,40},30] (* _Harvey P. Dale_, Apr 04 2013 *)

%Y Cf. A083328.

%K easy,nonn

%O 0,3

%A _Paul Barry_, Apr 27 2003

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)