23948

Appears in sequences

• Denominators of continued fraction convergents to sqrt(229).at n=6A041427
• Expansion of Product_{k>0} (1 + A004001(k)*x^k).at n=28A147869
• Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX3 array.at n=4A220530
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nXk array.at n=23A220532
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nXk array.at n=25A220532
• a(n) is the number of words of length n over an alphabet of size 3 that are in standard order and which have the property that every letter that appears in the word is repeated.at n=11A278988
• Numbers k such that k^2 + 1 divides 2^k + 4.at n=8A319233
• a(0) = ... = a(3) = 1; a(n) = Sum_{k=0..n-4} binomial(n-4,k) * a(k) * a(n-k-4).at n=15A336009