Number of partitions of an n-set with an even number of blocks of size 1.
A111724
Number of partitions of an n-set with an even number of blocks of size 1.
Terms
- a(0) =0a(1) =2a(2) =1a(3) =11a(4) =21a(5) =117a(6) =428a(7) =2172a(8) =10727a(9) =59393a(10) =345335a(11) =2143825a(12) =14038324a(13) =96834090a(14) =700715993a(15) =5305041715a(16) =41910528809a(17) =344714251149
External references
- oeis: A111724