132623405domain: NAppears in sequencesBinomial transform of poly-Bernoulli numbers A027649.at n=13A085350First subdiagonal of triangular array T: T(j,1) = 1 for ((j-1) mod 6) < 3, else 0; T(j,k) = T(j-1,k-1) + T(j-1,k) for 2 <= k <= j.at n=28A131023a(n) = 2^n - A108411(n).at n=27A167936