A367180 E.g.f. satisfies A(x) = 1 + (exp(x*A(x)^2) - 1)/A(x).
1, 1, 3, 19, 187, 2491, 41951, 855387, 20491395, 564179371, 17555839639, 609337562923, 23340215770235, 978038556122811, 44506423393073487, 2185725954288076987, 115224508775345033779, 6490005347933921581195, 388973650645651854960455
Offset: 0
Keywords
Links
- Seiichi Manyama, Table of n, a(n) for n = 0..372
Programs
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PARI
a(n) = sum(k=0, n, (2*n-k)!/(2*n-2*k+1)!*stirling(n, k, 2));
Formula
a(n) = Sum_{k=0..n} (2*n-k)!/(2*n-2*k+1)! * Stirling2(n,k).