27505
domain: N
Appears in sequences
- Denominators of continued fraction convergents to sqrt(505).at n=6A041965
- Number of positive integers <= 2^n of form x^2 + 20 y^2.at n=18A054233
- a(n) = A063997(n)/4.at n=33A088406
- Prime sieve of the square root of 2.at n=24A248831
- Coefficient of x^2 in minimal polynomial of the continued fraction [1^n,1/2,1,1,1,...], where 1^n means n ones.at n=11A266699
- The number of distinct positions on an infinite chessboard reachable by the (2,3)-leaper (or zebra) in at most n moves.at n=29A297740
- Number of nX5 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.at n=5A304344
- Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.at n=4A304345
- T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.at n=49A304347
- T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.at n=50A304347
- Expansion of e.g.f. 1 / (7 - 6 * exp(x))^(5/6).at n=4A365557