A027486 First column of triangle A027477, constructed from the Stirling numbers of the first kind.
1, 3, 23, 330, 7604, 256620, 11923260, 729524880, 56840099904, 5493503695680, 644870893060800, 90366972897801600, 14899694352066120960, 2855250418022402400000, 629258349435218754451200, 158034681938560927788288000, 44866854739192779425625292800
Offset: 1
Crossrefs
Cf. A027477 (Square of normalized Stirling matrix of the first kind).
Formula
a(n) = A027477(n,1).
a(n) = n!*Sum_{k=1..n} (-1)^(n-k)*Stirling1(n, k)/k. Sum_{n>=0} a(n)*x^n/n!^2 = -log(log(1-x))-Ei(1, log(1-x))-gamma. - Vladeta Jovovic, Jan 29 2005
Extensions
More terms from Sean A. Irvine, Nov 06 2019