249904

Appears in sequences

• Triangle read by rows: T(n,k) = 2^k*A123125(n,k).at n=40A141660
• Triangle T(n, k) = 2^(k-1) * E(n, k-1) where E(n,k) are the Eulerian numbers A173018, read by rows.at n=32A142075
• T(n, k) = E(n, k)*2^k where E(n,k) are the Eulerian numbers A173018, for n > 0 and 0 <= k <= n-1, additionally T(0,0) = 1.at n=33A156365
• A169759(n)/6.at n=9A169760
• Signed recurrence over enriched r-trees: a(n) = 2 * (-1)^n + Sum_y Product_{i in y} a(y) where the sum is over all integer partitions of n - 1.at n=39A301469