28696

Appears in sequences

• Number of permutations of length n which avoid the patterns 2143, 1324 (smooth permutations); or avoid the patterns 1342, 2431; etc.at n=9A032351
• Number of partitions of {1,...,n} into block sizes a power of 2.at n=10A115625
• a(n) is the smallest number which is the sum of two positive n-gonal numbers in more than one way.at n=19A199809
• Number of (n+2) X (7+2) 0..3 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=20A252718
• Number of set partitions of [n] such that eight is a multiple of each block size.at n=10A275426
• Expansion of Product_{k>=1} (1 + x^prime(k))^prime(k).at n=32A291647