reviewed
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(Python)
def A289296(n): return (n-1)*(n|1) # Chai Wah Wu, Jan 18 2023
Colin Barker, <a href="/A289296/b289296.txt">Table of n, a(n) for n = 0..1000</a>
If k == 0 or 1 (mod 4) then A198442(k) is a member of this sequence. - _ if k == 0 or 1 (mod 4). - _Bruno Berselli_, Jul 04 2017