69302

Appears in sequences

• Convolution of Fibonacci numbers and A001950.at n=18A023612
• a(1) = a(2) = 1, a(n) = A007947(a(n-1)) + a(n-2), for n >= 3, i.e., a(n) = a(n-2) plus the largest squarefree divisor of a(n-1).at n=29A121368
• T(n,k)=Number of (k*n)Xn binary matrices with all row sums equal and all column sums equal.at n=17A181236
• Number of (3n) X 3 binary matrices with all row sums equal and all column sums equal.at n=3A181237
• a(n) = Sum_k k*A333274(n,k).at n=17A333276