1028458

Appears in sequences

• Number of binary vectors of length n containing no singletons.at n=30A006355
• Dirichlet convolution of Fibonacci numbers with themselves.at n=28A034744
• Number of distinct permutations generated by shuffling n cards with "clump size" <= 2.at n=26A047992
• Expansion of 2*x*(1 - x)/(1 - 3*x + x^2).at n=15A052995
• Layer counting sequence for hyperbolic tessellation by cuspidal triangles of angles (Pi/3,Pi/3,0) (this is the classical modular tessellation).at n=27A054886
• a(0) = 1, then twice the Fibonacci sequence.at n=29A055389
• Row sums of array T in A055818; twice the odd-indexed Fibonacci numbers after initial term.at n=15A055819
• Number of ways to tile a 3 X 2n room with 1 X 2 Tatami mats. At most 3 Tatami mats may meet at a point.at n=27A068922
• Numbers with two representations as the sum of two Fibonacci numbers.at n=26A078642
• Number of meaningful differential operations of the n-th order on the space R^6.at n=25A090991
• a(n) = gcd(Lucas(n)+1, Fibonacci(n)+1).at n=58A115313
• a(n) = 2*F(n-1) = L(n) - F(n), where F(n) and L(n) are Fibonacci and Lucas numbers respectively.at n=30A118658
• A nonsense sequence.at n=27A122577
• Number of base 4 n-digit numbers with adjacent digits differing by one or less.at n=14A126358
• Expansion of g.f. x*(1+x+x^2)/(1-x-x^2).at n=28A128588
• Row sums of triangle A131779.at n=27A131780
• Expansion of x - x^2*(2*x+1)*(x^2-2) / ( (x^2-x-1)*(x^2+x-1) ).at n=28A133585
• Inverse score permutation of an Fibonacci -anti-Fibonacci zero sum game of 2 X 2 matrices.at n=18A134016
• Number of n X 2 binary arrays with all 1s connected, a path of 1s from top row to bottom row, and no 1 having more than two 1s adjacent.at n=26A163714
• Number of n X 2 binary arrays with all 1's connected, all corners 1, and no 1 having more than two 1's adjacent.at n=30A163733