54684

Appears in sequences

• Aliquot sequence starting at 276.at n=20A008892
• Expansion of e.g.f.: sech(log(x+1)-sin(x))=1-3/4!*x^4+30/5!*x^5-180/6!*x^6+1113/7!*x^7...at n=9A013221
• Sums of 4 distinct powers of 6.at n=30A038480
• a(n) = (n+1)(n+2)^2*(n+3)^2*(n+4)^2*(n+5)(3n^2 + 13n + 15)/43200.at n=5A107941
• Triangle T(n, k, m) = (m+1)^n*t(n, m)*t(k, n-m)/(k! * (n-k)!), where T(0, k, m) = 1, t(n, k) = Product_{j=1..n} ( Sum_{i=0..j-1} (m+1)^i ), and t(n, 0) = n!, read by rows.at n=21A157285
• Numbers with prime factorization pq^2r^2s^2.at n=32A189344
• Number of n X n 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=5A207062
• Number of n X 6 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=5A207066
• Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=5A207073
• Nonsquare numbers whose sum of proper square divisors is a square greater than 1.at n=18A232555
• Numbers whose sum of proper square divisors is a square greater than 1.at n=21A232556
• a(n) = (2^n / n!) * (2^1 - 1) * (2^2 - 1) * ... * (2^n - 1).at n=6A305627
• a(n) = Product_{d|n, d<n} prime(A286378(d)-1).at n=41A317942
• a(n) = n * Sum_{d|n} binomial(d+4,5)/d.at n=20A343546