Number of partitions of n-set in which number of blocks of size 2k is odd (or zero) for every k.

A130221

Number of partitions of n-set in which number of blocks of size 2k is odd (or zero) for every k.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =37a(6) =158a(7) =667a(8) =2740a(9) =13461a(10) =74710a(11) =412095a(12) =2406880a(13) =15450541a(14) =103187698a(15) =715323395a(16) =5236160612a(17) =40014337437a(18) =318488475658

External references