A012399 arctan(atan(x)*log(x+1))=2/2!*x^2-3/3!*x^3-10/5!*x^5-32/6!*x^6...

2, -3, 0, -10, -32, 1596, -10080, 27936, -19008, -4728240, 113762880, -1378522080, 12151639680, -24566643360, -3018767431680, 84947924490240, -1424022331422720, 18489594521756160, -42627235124920320