OFFSET
2,3
LINKS
Gheorghe Coserea, Table of n, a(n) for n = 2..101
Irving Kaplansky and John Riordan, The problem of the rooks and its applications, Duke Mathematical Journal 13.2 (1946): 259-268. The array is on page 267.
FORMULA
See A272644.
PROG
(PARI)
A(n, m) = sum(i=0, m, stirling(m+1, i+1, 2) * (-1)^((m-i)%2) * i^(n - m) * i!);
apply(vecmax, vector(22, n, vector(n, m, A(n+1, m)))) \\ Gheorghe Coserea, May 16 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 07 2016
EXTENSIONS
More terms from Gheorghe Coserea, May 16 2016
STATUS
approved