133296

Appears in sequences

• Number of subsets of {1, 2, ..., n} containing n and having <=8 pairwise coprime elements.at n=40A186992
• Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=7A252402
• a(n) = (8*n+13*n^3+3*n^5)/24; also the sum of triangular numbers taken in successive groups of increasing size (see Example).at n=15A260513