E.g.f. -log(sech(x)-log(x+1))= x+ 1/2!*x^2+4/3!*x^3+3/4!*x^4+33/5!*x^5... 1, 1, 4, 3, 33, 155, 1195, 5418, 72373, 496027, 6851051, 59706592, 986009607
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