5445440
domain: N
Appears in sequences
- a(n) = Product_{k=1..n} (9*k - 1); 9-factorial numbers.at n=5A049211
- Triangle sequence: T(n, k) = -Product_{j=0..k+1} ((n+1)*j - 1).at n=40A153187
- Triangle read by rows: T(n,k) = Product_{i=0..k-2} (i*n + n - 1).at n=32A153273
- a(n) = A332560(n)/A332559(n).at n=10A332561
- a(n) is the least integer that can be expressed as the difference of two octagonal numbers in exactly n ways.at n=32A334037