Number of partitions of n-set in which number of blocks of size k is odd (or zero) for every k.

A130220

Number of partitions of n-set in which number of blocks of size k is odd (or zero) for every k.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =5a(5) =27a(6) =117a(7) =331a(8) =1213a(9) =6579a(10) =47193a(11) =140527a(12) =1213841a(13) =4617927a(14) =48210879a(15) =243443739a(16) =2392565149a(17) =10377087115a(18) =125434781845a(19) =725455816883

External references