25361

Appears in sequences

• Molien series for A_9.at n=45A008632
• Semiprimes in A054552.at n=26A113690
• The number of reachable states in a simple two-player counting game, in which each player starts with the pair (1,1) and one move is to add one of the opponent's numbers to one of your own numbers, but no number can grow above a pre-defined maximum n. The game continues until one of the players has no legal moves left. The winner is the one having the higher sum of his numbers.at n=20A161531
• G.f. satisfies: A(x) = exp( Sum_{n>=1} A(A179491(n)*x^n)*x^n/n ), where A(x) = exp( Sum_{n>=1} A179491(n)*x^n/n ).at n=12A179490
• Number of 2 X 2 matrices having all terms in {1,...,n} and nonnegative even determinant.at n=16A211066
• Fundamental discriminants of real quadratic number fields with class number 9.at n=30A218159
• G.f. A(x) satisfies: 1/(1-x) = Sum_{n>=0} (1+x)^(n^2) * x^n / A(x)^n.at n=9A320954
• a(n) is the initial transient (converted to base 10), before the periodic part, on the n-th diagonal from the left of rule-30 1-D cellular automaton, when started from a single ON cell, or -1 if there is no transient part.at n=31A364241