OFFSET
1,2
LINKS
R. C. Read, Combinatorial problems in theory of music, Discrete Math. 167 (1997), 543-551.
Ronald C. Read, Lily Yen, A note on the Stockhausen problem, J. Comb. Theory, Ser. A 76, No. 1 (1996), 1-10.
FORMULA
a(n) = A008270(n) - Sum_{k=1..n} n! * k / (n-k)! - Sum_{k=2..n+1} n! * k * (k-2) / (n-k+1)! [from Read and Yen]. - Sean A. Irvine, Mar 08 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved