20027

Appears in sequences

• Number of nondecreasing -2..2 vectors of length n whose dot product with some other -2..2 vector equals n.at n=23A226334
• Number of (n+1) X (4+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.at n=4A231215
• Number of (n+1)X(5+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.at n=3A231216
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.at n=31A231219
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order.at n=32A231219
• a(n) = Sum_{d|n} pxi(d), where pxi(m) is the product of totatives of m (A001783).at n=13A280258
• Index where n first appears in A381597.at n=34A381599
• a(0) = 1; thereafter a(n) = 10*n^2 - 5*n + 2.at n=45A383466