79419

Appears in sequences

• Triangle, read by rows, where column 0 is [1,-1,-2,-3,...,-n,...] and column k+1 is generated by the binomial transform of column k preceded by a zero (column k includes the k zeros above the main diagonal).at n=60A117334
• a(n) = a(n-1)+9*a(n-2) initialized with a(0)=1, a(1)=3.at n=9A122994
• a(n) = Sum_{k=1..n} sigma(k)*sigma(2*k), where sigma(n) = A000203(n) is the sum of the divisors of n.at n=31A347108
• Number of sensed planar maps with n vertices and 2 faces.at n=10A380237