30846

Appears in sequences

• Number of 3-covers of an unlabeled n-set.at n=19A005783
• Third-from-right diagonal of triangle A121207.at n=8A045501
• Number of rooted trees with n nodes and 12 leaves.at n=5A055287
• Integers i such that 9*i = 25 X i, but 17*i is not 49 X i.at n=35A115811
• Triangle read by rows. The definition is by diagonals. The r-th diagonal from the right, for r >= 0, is given by b(0) = b(1) = 1; b(n+1) = Sum_{k=0..n} binomial(n+2,k+r)*a(k).at n=63A121207
• Triangle read by rows: T(n,k) is the number of set partitions of {1,2,...,n} in which the size of the last block is k, 1<=k<=n; the blocks are ordered with increasing least elements.at n=46A124496
• Row sums of triangle A137639.at n=37A137640
• Triangle read by rows, (1 / ((-1)*A129184 * A007318 + I)) - I, I = Identity matrix.at n=47A160185
• Eigentriangle of the binomial matrix.at n=57A186020
• Squarefree terms of A276655.at n=37A276756
• Partial sums of A299266.at n=34A299267
• a(n) is the least number x such that x^2 + 1 and 2^x + 1 are both divisible by A387595(n).at n=37A387642