19921

Appears in sequences

• Expansion of tan(x)*cosh(x).at n=4A003719
• E.g.f. tan(x)*exp(x).at n=9A009739
• Composite numbers whose prime factors contain no digits other than 1 and 8.at n=7A036308
• Boustrophedon transform of (n+1) mod 2.at n=9A062272
• Triangle read by rows: T(n,k) is the number of set partitions of {1,2,...,n} in which the last block is the singleton {k}, 1<=k<=n; the blocks are ordered with increasing least elements.at n=60A108458
• Number of labeled partitions of (n,n) into pairs (i,j).at n=5A108459
• Triangle read by rows: T(n,k) is the number of partitions of the set {1,2,...,n}, having exactly k blocks consisting only odd entries (0<=k<=ceiling(n/2)).at n=35A124420
• Number of partitions of the set {1,2,...,n} having no blocks that contain only odd entries.at n=10A124421
• Triangle read by rows: T(n,k) is the number of partitions of the set {1,2,...,n}, having exactly k blocks consisting only even entries (0<=k<=floor(n/2)).at n=30A124422
• Number of partitions of the set {1,2,...,n} having no blocks that contain only even entries.at n=10A124423
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.at n=8A149476
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (0, 1, 1), (1, 0, 0), (1, 1, 1)}.at n=7A151151
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=7A151152
• Least number having exactly two odd prime factors that differ by 2*n^2.at n=29A190052
• Triangle read by rows, expansion of exp(x*exp(z)*tan(z)).at n=46A298213
• Least k such that the k-th squarefree number has exactly n zeros in its binary expansion.at n=14A372473
• Least k such that the k-th squarefree number has binary expansion of length n. Index of the smallest squarefree number >= 2^n.at n=15A372540