212898

Appears in sequences

• Antidiagonal sums of symmetric square array A101515 and also equals the binomial transform of a sequence formed from terms of A101514 repeated twice.at n=13A101516
• Number of (n+2)X3 0..3 arrays with each 3X3 subblock nonsingular.at n=0A184650
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock nonsingular.at n=0A184652
• Smallest squarefree term of adjacent squarefree pairs in the sequence of practical numbers (A005153).at n=17A268156
• Numbers that are the concatenation of two palindromes and that have exactly two palindromic factors, all with the same number of decimal digits.at n=30A355148