27678

Appears in sequences

• Monotonically increasing sequence of least positive integers, a(1)=1, such that the self-convolution produces all squares.at n=26A087150
• Number of polybes.at n=5A088678
• a(n) = 19 + floor( Sum_{j=1..n-1} a(j) / 2 ).at n=18A120144
• Triangle T, read by rows, where the matrix square T^2 results in shifting T right one column to drop the secondary diagonal.at n=28A152391
• Column 0 of triangle A152391.at n=7A152392
• a(n) = (-1)^n*Sum((-1)^j*b(j), j=1..n), where b(n)=(n-1)!*(n^2 - n + 1) = A001564(n-1) (n>=1).at n=6A180195
• Number of nondecreasing -n..n vectors of length 5 whose dot product with some lexicographically greater or equal nondecreasing -n..n vector equals 5.at n=8A226426
• Sum of the first n strobogrammatic numbers.at n=25A230833
• Triangle read by rows: T(n,m) (n >= 1, 1 <= m <= n) = number of set partitions of [n], avoiding 12343, with m blocks.at n=60A250118
• Number of partitions of n with even minimal part and odd maximal part.at n=42A325344
• Number of distinct n X n patterns in the squiral tiling.at n=41A375874