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a(n) = 3*(25*n + 1).
2

%I #12 Feb 16 2024 17:06:39

%S 3,78,153,228,303,378,453,528,603,678,753,828,903,978,1053,1128,1203,

%T 1278,1353,1428,1503,1578,1653,1728,1803,1878,1953,2028,2103,2178,

%U 2253,2328,2403,2478,2553,2628,2703,2778,2853,2928,3003,3078,3153,3228,3303

%N a(n) = 3*(25*n + 1).

%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).

%t 75*Range[0, 50]+3 (* _Paolo Xausa_, Feb 16 2024 *)

%o (PARI) a(n)=3*(25*n+1) \\ _Charles R Greathouse IV_, Jul 10 2016

%K nonn,easy

%O 0,1

%A _George E. Antoniou_, Aug 25 2004

%E More terms from _Robert G. Wilson v_ and Mark Hudson (mrmarkhudson(AT)hotmail.com), Aug 26 2004