OFFSET
0,5
EXAMPLE
The a(0) = 1 through a(7) = 12 compositions:
() (1) . . (22) (1121) (1113) (1123)
(112) (1211) (1122) (1132)
(211) (1221) (2311)
(2211) (3211)
(3111) (11131)
(11212)
(11221)
(12112)
(12211)
(13111)
(21121)
(21211)
MATHEMATICA
Table[Length[Select[Join@@Permutations/@ IntegerPartitions[n], MemberQ[Subsets[#], Reverse[Length/@Split[#]]]&]], {n, 0, 15}]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gus Wiseman, May 15 2022
STATUS
approved