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A345963 a(n) = (q^2-q+1)/3 where q = 2^(2*n+1) = A004171(n). 0
1, 19, 331, 5419, 87211, 1397419, 22366891, 357903019, 5726579371, 91625794219, 1466014804651, 23456245263019, 375299957762731, 6004799458421419, 96076791871613611, 1537228672093301419, 24595658762082757291, 393530540227683855019, 6296488643780380633771, 100743818301035845954219 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

Peter Cameron, A little problem, May 31 2021.

FORMULA

a(n) = A002061(A004171(n))/3.

a(n) = (A060869(n) + 1)/4. - Hugo Pfoertner, Jun 30 2021

MAPLE

a:= n-> (q-> (q^2-q+1)/3)(2^(2*n+1)):

seq(a(n), n=0..20);  # Alois P. Heinz, Jun 30 2021

MATHEMATICA

Table[(2^(4*n + 2) - 2^(2*n + 1) + 1)/3, {n, 0, 19}] (* Amiram Eldar, Jun 30 2021 *)

PROG

(PARI) a(n) = my(q=2^(2*n+1)); (q^2-q+1)/3;

CROSSREFS

Cf. A002061, A004171.

Sequence in context: A014900 A121324 A093973 * A202043 A142549 A049629

Adjacent sequences:  A345960 A345961 A345962 * A345964 A345965 A345966

KEYWORD

nonn

AUTHOR

Michel Marcus, Jun 30 2021

STATUS

approved

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Last modified September 25 06:22 EDT 2022. Contains 356959 sequences. (Running on oeis4.)