302120

Appears in sequences

• Row sums of triangle defined in A095181.at n=34A160915
• Numbers whose k digits can be permuted into a new k-digit number according to rules explained in the Comments section.at n=20A330418
• a(n) = Sum_{k=0..floor(n/2)} binomial(k+2,2) * binomial(k,3*(n-2*k)).at n=31A392255