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PROG
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(PARI) {a(n) = if(n==0, 1, n!*polcoeff(exp(sum(k=1, n, k*(k+1)/2*a(k-1)*x^k/k!)+x*O(x^n)), n))}
for(n=0, 25, print1(a(n), ", "))
(PARI) {a(n) = if(n==0, 1, sum(k=1, n, k*(k+1)/2*binomial(n-1, k-1)*a(k-1)*a(n-k)))}
for(n=0, 25, print1(a(n), ", "))
(PARI) {a(n) = my(A=1); for(i=1, n, A = exp(deriv(x^2*A/2 +x^2*O(x^n)))); n!*polcoeff(A, n)}
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