Number of set partitions of [n] with alternating block size parities.

A275679

Number of set partitions of [n] with alternating block size parities.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =3a(5) =20a(6) =43a(7) =136a(8) =711a(9) =1606a(10) =12653a(11) =36852a(12) =250673a(13) =1212498a(14) =6016715a(15) =45081688a(16) =196537387a(17) =1789229594a(18) =8963510621a(19) =76863454428a(20) =512264745473

External references