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

1,2

Links

Table of n, a(n) for n=1..17.

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

Crossrefs

Cf. A027477 (Square of normalized Stirling matrix of the first kind).

Sequence in context: A338301 A129458 A118184 * A377742 A092664 A363577

Adjacent sequences: A027483 A027484 A027485 * A027487 A027488 A027489

Keyword

nonn,easy

Author

Olivier Gérard

Extensions

More terms from Sean A. Irvine, Nov 06 2019

Status

approved