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A067772 One half of the number of non-self-conjugate balanced partitions. 2

%I #11 Jun 18 2022 17:36:18

%S 0,0,0,0,0,0,1,0,1,1,2,2,4,4,6,7,10,12,17,19,26,31,40,47,61,72,91,108,

%T 134,159,197,231,283,335,405,477,576,676,810,950,1131,1325,1572,1834,

%U 2166,2527,2970,3455,4051,4702,5493,6366,7412,8574,9959,11493,13315,15345,17729,20392

%N One half of the number of non-self-conjugate balanced partitions.

%H Andrew Howroyd, <a href="/A067772/b067772.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = (A047993(n) - A000700(n))/2.

%F a(n) = A331262(n)/2. - _Omar E. Pol_, Jun 18 2022

%o (PARI) seq(n) = {my(A=O(x*x^n), m=1); while(3*m^2-m <= 2*n, m++); Vec(1 + sum(k=1, m-1, (-1)^k * ( x^((3*k^2+k)/2) - x^((3*k^2-k)/2) ), A )/eta(x + A) - prod(k=1, (n+1)\2, 1 + x^(2*k-1) + A), -n)/2} \\ _Andrew Howroyd_, Apr 20 2021

%Y Cf. A000700, A000701, A047993, A331262.

%K easy,nonn

%O 1,11

%A _Naohiro Nomoto_, Feb 06 2002

%E Terms a(37) and beyond from _Andrew Howroyd_, Apr 20 2021

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Last modified April 16 14:51 EDT 2024. Contains 371749 sequences. (Running on oeis4.)