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A368443
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Expansion of e.g.f. exp(-x) / (4 - 3*exp(2*x)).
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2
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1, 5, 73, 1517, 42193, 1466645, 61177753, 2977205117, 165583073953, 10360379100965, 720265883283433, 55081115403503117, 4595165623000889713, 415299796681103596085, 40420990463421954662713, 4215173033091627126703517, 468870152072269125977393473
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (-1)^n + 3 * Sum_{k=1..n} 2^k * binomial(n,k) * a(n-k).
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PROG
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(PARI) a_vector(n) = my(v=vector(n+1)); for(i=0, n, v[i+1]=(-1)^i+3*sum(j=1, i, 2^j*binomial(i, j)*v[i-j+1])); v;
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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