134784

Appears in sequences

• a(n) = 10*n^3 - 6*n^2.at n=24A006592
• a(n) = n*(n-1)^4/2.at n=13A019583
• E.g.f. A(x) satisfies A( x/(exp(x)*cosh(x)) ) = exp(4*x)*cosh(4*x).at n=5A218302
• Record values of gcd(sigma(n), phi(n)) (A009223).at n=38A222712
• G.f.: Sum_{n>=1} x^(n*(n-1)/2) * (G(x)^n + 1/G(x)^(n-1)), where G(x) is the g.f. of A268300.at n=7A268302
• G.f.: x^2 * f''(x), where f(x) = Product_{k>=1} (1 + x^k).at n=27A278407
• p-INVERT of (1,0,0,1,0,0,1,0,0,...), where p(S) = (1 - S^2).at n=34A289918
• p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = (1 - S)(1 + S^2).at n=33A291741
• Table read by rows: T(n,k) is the number of stable marriage instances with n men and n+1 women in which some "rejecting" woman receives exactly k proposals.at n=9A309933
• Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).at n=37A320425
• a(n) = Sum_{k=0..floor(n/2)} binomial(4*k,n-2*k).at n=17A375314
• Expansion of 1 / ((1-x)^2 - x^6).at n=31A392541