OFFSET
1,2
COMMENTS
See A339297 for additional details.
PROG
(PARI) \\ See A339297 for R(n, k).
seq(n)={sum(k=1, n, R(n, k)*sum(r=k, n, binomial(r, k)*(-1)^(r-k)) )}
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 22 2020
STATUS
approved