23665
domain: N
Appears in sequences
- n! has a palindromic prime number of digits.at n=33A035067
- Number of Motzkin paths of length n with no peaks at level 1.at n=13A089372
- Number of 4k+3 integers in range [2^n, 2^(n+1)] whose Jacobi-vector is not a valid Motzkin-path (A095101).at n=16A095091
- Triangle read by rows: T(n,k) is number of Motzkin paths of length n having k peaks at height 1.at n=49A097611
- Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the leftmost leaf is at level k.at n=40A101409
- Number of trisubstituted alkanes C_n H_{2n-1} X_2 Y with n carbon atoms.at n=10A135142
- Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 6.at n=46A136888
- Numbers k such that (7*10^(2k+1) - 18*10^k - 7)/9 is prime.at n=15A183180
- G.f. satisfies: A(x) = 1 + x*A(x)^2 + x^2/A(x).at n=10A201969
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 121", based on the 5-celled von Neumann neighborhood.at n=32A270208
- Total number of binary digits in the partitions of n into odd parts.at n=39A319142