126225

Appears in sequences

• a(n) = (n+1)*(2*n+1)*(3*n+1)*(4*n+1).at n=8A011245
• a(0)=1, a(1)=2, a(n) = sum_{k=0}^{k=n-1} 2^k a(k).at n=6A015486
• a(n) = 225*(n-1)*(n-2)/2.at n=32A027470
• 8-fold factorials: a(n) = Product_{k=0..n-1} (8*k+1).at n=5A045755
• Octuple factorial, 8-factorial, n!8, n!!!!!!!!.at n=33A114800
• Triangle T(n,k) = Product_{j=0..k} n*j+1.at n=40A153189
• Numbers k such that phi(k)=p^2, where p is product of digits of k.at n=15A153427
• Minimal largest k in set of n fractions of the form (k-1)/k all of whose ratios (smaller fraction / larger fraction) are also of that form.at n=8A188715
• Numbers that set records for number of divisors of n(n-1).at n=30A192488
• Odd octagonal pyramidal numbers.at n=25A218326
• Triangle T(n,k) represents the coefficients of (x^9*d/dx)^n, where n=1,2,3,...;generalization of Stirling numbers of second kind A008277, Lah-numbers A008297.at n=10A223511
• a(n) = n*(n+1)*(7*n-6)/2.at n=33A256718
• a(n) = smallest k such that A260273(k) >= 2^n.at n=20A261396
• a(n) = (n + 1)^2*(5*n^2 + 10*n + 2)/2.at n=14A269237
• Numbers that have exactly 9 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=1A321159
• Numbers k such that A360327(k) > 2*k.at n=14A360328