40021

Appears in sequences

• Numbers n with property that 42*n+37 is in A175284.at n=19A175285
• Least nonnegative integer that cannot be expressed as the determinant of an n X n matrix whose entries are a permutation of the multiset {1^n, ..., n^n}.at n=5A322576
• Number of unbranched tri-4-catafusenes under the symmetry point group C_{2v} as a function of the number of hexagons (see Cyvin et al. (1996) for precise definition).at n=18A323939
• a(n) = binomial(n+3, 4) + binomial(n+1, 3) + 1.at n=29A368881
• Numbers k with the property that k is the next lexicographically earliest number that cannot be expressed as a linear sum of the squares of preceding terms of the sequence with coefficients of 0, +1 or -1, with a(1)=1.at n=16A390487