19923090075
domain: N
Appears in sequences
- a(n) = Product_{i=1..n} (2^i - 1). Also called 2-factorial numbers.at n=8A005329
- Array A(n, k) = Product_{j=1..n} ( (k+1)^j - 1 ) with A(n, 0) = n!, read by antidiagonals.at n=53A156540
- Square array T(n, k) = Product_{j=1..n} ( Sum_{i=0..j-1} ((k+1)^2 - (k+1))^i ) with T(n, 0) = n!, read by antidiagonals.at n=53A156881
- Triangle of numbers S(n,k) (0 <= k <= n) arising in the enumeration of interval orders without duplicated holdings.at n=36A259876
- Triangle read by rows. T(n,k) is the number of flags in an n dimensional vector space over GF(2) that have length exactly k, n >= 0, 0 <= k <= n.at n=44A289546
- The q-analog T(q; n,k) of the triangle A163626 for 0 <= k <= n, for q = 2.at n=44A308326
- Square array A(n,k), n >= 0, k >= 1, read by antidiagonals: A(n,k) = Product_{j=1..n} (k^j - 1).at n=53A320354