57681

Appears in sequences

• Number of nX2 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in increasing order.at n=26A166814
• Number of n X 5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=7A207700
• a(n) = n*(5*n^2-8*n+5)/2.at n=29A226449
• Pseudoprimes to base 8 that are not squarefree.at n=15A243090
• a(n) = Sum_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1).at n=37A249490
• Maximal term of TRIP-Stern sequence of level n corresponding to permutation triple (e,23,e).at n=32A271488
• Negated inverse Euler transform of {-1 if n is a triangular number else 0, n > 0} = -A010054.at n=33A320784