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Odd bisection of A277020: a(n) = A277020(2n+1).
5

%I #21 Jan 01 2024 19:48:27

%S 1,5,13,21,45,93,109,85,173,477,957,733,749,1501,877,341,685,3549,

%T 12221,7133,14269,49021,28605,5853,5869,30685,61373,23517,12013,24029,

%U 7021,1365,2733,28125,192445,97245,384957,2031485,1032125,113629,227261,4128637,16252669,3112829,1564605,6225789,913341,46813,46829,915421

%N Odd bisection of A277020: a(n) = A277020(2n+1).

%H Antti Karttunen, <a href="/A277189/b277189.txt">Table of n, a(n) for n = 0..8191</a>

%F a(n) = A277020(2*n + 1).

%F a(n) = A156552(A277324(n)).

%F Other identities. For all n >= 0:

%F a(n) = 1 mod 4.

%o (Scheme) (define (A277189 n) (A277020 (+ n n 1)))

%Y Cf. A156552, A277020, A277324.

%Y Terms form a proper subset of A247648.

%K nonn,look

%O 0,2

%A _Antti Karttunen_, Oct 08 2016

%E Offset changed from 1 to 0 by _Antti Karttunen_, Oct 11 2016