This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A367629 #51 Aug 23 2024 18:13:12
%S A367629 8,240,65504,4294967232,18446744073709551488,
%T A367629 340282366920938463463374607431768211200,
%U A367629 115792089237316195423570985008687907853269984665640564039457584007913129639424
%N A367629 a(n) = 2^2^(n + 1) - 2^(n + 2).
%C A367629 a(n) is the absolute value totals of the characteristic polynomial coefficients of n-qubit normalized Hadamard matrices, excluding the 2nd and next-to-last nonzero entries.
%C A367629 a(n) is also the total of the entries in row 2^(n+1) of Pascal's triangle (A007318), excluding the 2nd and next-to-last entries.
%H A367629 J Gregory Moxness, <a href="/A367629/b367629.txt">Table of n, a(n) for n = 1..10</a>
%F A367629 a(n) = A107584(2^n).
%t A367629 Table[2^2^(n+1)-2^(n+2),{n,10}] (* _Harvey P. Dale_, Aug 23 2024 *)
%o A367629 (Python)
%o A367629 def A367629(n): return (1<<(m:=1<<n+1))-(m<<1) # _Chai Wah Wu_, Nov 29 2023
%Y A367629 Cf. A007318, A107584.
%K A367629 nonn,easy
%O A367629 1,1
%A A367629 _J Gregory Moxness_, Nov 24 2023
%E A367629 Previous Mathematica program replaced by _Harvey P. Dale_, Aug 23 2024