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A176337
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a(n) = 1 + (1-2^n)*a(n-1) for n > 0, a(0)=0.
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4
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0, 1, -2, 15, -224, 6945, -437534, 55566819, -14169538844, 7240634349285, -7407168939318554, 15162474818785080039, -62090334382924902759704, 508581928930537878504735465, -8332097741669002063543081123094
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OFFSET
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0,3
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LINKS
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MAPLE
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if n = 0 then
0;
else
1+(1-2^n)*procname(n-1) ;
end if;
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MATHEMATICA
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a[n_, q_]:= a[n, q]= If[n==0, 0, (1-q^n)*a[n-1, q] +1]; Table[a[n, 2], {n, 0, 15}]
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PROG
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(PARI) q=2; a(n, q) = if(n==0, 0, 1 -(q^n-1)*a(n-1, q) );
(Magma)
function a(n, q)
if n eq 0 then return 0;
else return 1 - (q^n-1)*a(n-1, q);
end if; return a; end function;
(Sage)
def a(n, q):
if (n==0): return 0
else: return 1 - (q^n-1)*a(n-1, q)
(GAP)
a:= function(n, q)
if n=0 then return 0;
else return 1 - (q^n-1)*a(n-1, q);
fi; end;
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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