Irregular triangle read by rows: T(n, k) is the number of k-element proper ideals of the n-dimensional Boolean lattice, with 0 < k < 2^n.

A269699

Irregular triangle read by rows: T(n, k) is the number of k-element proper ideals of the n-dimensional Boolean lattice, with 0 < k < 2^n.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =1a(5) =3a(6) =3a(7) =4a(8) =3a(9) =3a(10) =1a(11) =1a(12) =4a(13) =6a(14) =10a(15) =13a(16) =18a(17) =19a(18) =24a(19) =19a(20) =18a(21) =13a(22) =10a(23) =6a(24) =4a(25) =1a(26) =1a(27) =5a(28) =10a(29) =20

External references