OFFSET
1,5
EXAMPLE
a(6) counts these partitions: 51, 42, 411, 3111.
MATHEMATICA
Table[Count[IntegerPartitions[n], p_ /; !MemberQ[p, Floor[(Min[p] + Max[p])/2]]], {n, 30}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Feb 27 2014
STATUS
approved