OFFSET
0,5
COMMENTS
Central coefficients T(n,floor(n/2)) of number triangle A004248. The central coefficients T(2n,n) of this triangle are n^n or A000312.
a(n) is the number of partitions of [n] such that each block has exactly one even element: a(5) = 8: 1235|4, 123|45, 125|34, 12|345, 1345|2, 134|25, 145|23, 14|235. - Alois P. Heinz, Jun 01 2023
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..772
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jul 13 2005
STATUS
approved