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A083080 Main diagonal of number array A083075. 4

%I

%S 1,3,33,547,11713,309411,9763393,359046339,15096500481,714852041923,

%T 37660464739681,2185503641764323,138548894120306881,

%U 9527726662032987747,706481006206076565633,56192761405186331759491

%N Main diagonal of number array A083075.

%H Vincenzo Librandi, <a href="/A083080/b083080.txt">Table of n, a(n) for n = 0..300</a>

%F a(n) = (n*(2n+3)^n + 1)/(n+1).

%o (MAGMA) [(n*(2*n+3)^n+1)/(n+1): n in [0..20]]; // _Vincenzo Librandi_, Nov 12 2011

%Y Cf. A083081, A083082.

%K easy,nonn

%O 0,2

%A _Paul Barry_, Apr 23 2003

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Last modified August 9 05:12 EDT 2020. Contains 336319 sequences. (Running on oeis4.)