23272

Appears in sequences

• Starts for strings of at least five consecutive nonsquarefree numbers.at n=13A078144
• a(n) = sum of terms in n-th row of A078448.at n=22A078449
• Triangle T(n,m) read by rows: T(n,m) = ( Eulerian(n,m) - Binomial(n,m)^2 )/2, n >= 4, 2 <= m = <= n-1.at n=28A154353
• Triangle T(n,m) read by rows: T(n,m) = ( Eulerian(n,m) - Binomial(n,m)^2 )/2, n >= 4, 2 <= m = <= n-1.at n=33A154353
• 0-sequence of reduction of (3n-2) by x^2 -> x+1.at n=14A192311
• a(n) = 54*n^2 - 26*n + 4 (n>=1).at n=20A304381
• a(n) = 17*n^2 - 1.at n=37A321180
• Expansion of e.g.f. 1 / (4 - 3 * exp(x))^(2/3).at n=5A365558
• Triangle read by rows: T(n, k) = 2^k * hypergeom([-n, -k], [], 1/2).at n=33A375854
• Triangle of generalized Stirling numbers of the lower level of the hierarchy (case m=2).at n=15A377058
• G.f. A(x) satisfies 1/2 = Sum_{n=-oo..+oo} x^n * (A(x) + x^n)^(n-1).at n=6A379763