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a(n) = ceiling(4n*log(4n)).
8

%I #22 Jan 19 2024 20:18:10

%S 6,17,30,45,60,77,94,111,130,148,167,186,206,226,246,267,287,308,330,

%T 351,373,395,417,439,461,484,506,529,552,575,598,622,645,669,692,716,

%U 740,764,788,813,837,861,886,911,935

%N a(n) = ceiling(4n*log(4n)).

%H Vincenzo Librandi, <a href="/A212461/b212461.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = A050502(4*n). - _Michel Marcus_, Jan 11 2016

%t Table[Ceiling[4*n*Log[4*n]], {n, 80}] (* _Vincenzo Librandi_, Feb 13 2013 *)

%o (Derive) PROG(y := [], x := 100, LOOP(IF(x = 0, RETURN y), y := ADJOIN(CEILING(4·x·LOG(4·x)), y), x := x - 1))

%o (Magma) [Ceiling(4*n*Log(4*n)): n in [1..80]]; // _Vincenzo Librandi_, Feb 13 2013

%o (PARI) a(n) = ceil(4*n*log(4*n)); \\ _Michel Marcus_, Jan 11 2016

%Y Cf. A050502, A050504, A212455, A212456, A212457, A212458, A212459, A212460, A212462.

%K easy,nonn

%O 1,1

%A _Mohammad K. Azarian_, May 31 2012