18092

Appears in sequences

• Dodecahedral surface numbers: a(0)=0, a(1)=1, a(2)=20, thereafter 2*((3*n-7)^2 + 21).at n=34A007589
• a(n) = Sum_{i=0..n} digsum_3(i)^4, where digsum_3(i) = A053735(i).at n=56A231505
• a(n) = Sum_{k=0..7} (n + k)^2.at n=44A276026
• Number of compositions of n whose set of distinct parts is pairwise coprime, where a singleton is always considered coprime.at n=16A337664
• a(n) is the number of tetrapods standing on the four edges of an n X n grid, so that no two feet are the same distance apart and no foot is on a corner. Tetrapods with congruent footprints are counted only once.at n=19A353447