33640

Appears in sequences

• a(n) = Sum_{k=1..n} -mu(k+1) * a(n-k), with a(0)=1.at n=20A073776
• Triangle read by rows: T(n,m)=A060187(1+n,1+m) *n! / (n-m)!at n=17A177429
• The Wiener index of the zig-zag polyhex nanotube TUHC_6[2n,2] defined pictorially in Fig. 1 of the Eliasi et al. reference.at n=18A227703
• Number of (n+1)X(1+1) 0..3 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.at n=2A235502
• Number of (n+1)X(3+1) 0..3 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.at n=0A235504
• T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with the sum of each 2 X 2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.at n=3A235506
• T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with the sum of each 2 X 2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.at n=5A235506
• Number of (n+1)X(3+1) 0..3 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.at n=0A235745
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.at n=3A235747
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.at n=5A235747
• Alternating square row sums of the table A072233 (A008284).at n=34A238313
• Number of (3+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=8A250732