OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..155 (terms n = 1..16 from Don Knuth)
Don Knuth, Parades and poly-Bernoulli bijections, Mar 31 2024. See (19.2).
FORMULA
a(n) = Sum_{k=0..3n} (-1)^k * A212220(n,k). - Alois P. Heinz, May 02 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 04 2024
EXTENSIONS
More terms from Don Knuth, Apr 07 2024
a(0)=1 prepended by Alois P. Heinz, Apr 17 2024
STATUS
approved