40890

Appears in sequences

• Quadrinomial coefficients: C(2+n,n) + C(3+n,n) + C(4+n,n).at n=28A005718
• Digital sum of the 2^n-th partition number.at n=26A129491
• G.f. is the polynomial (Product_{k=1..30} (1 - x^(3*k)))/(1-x)^30.at n=4A162736
• Partial sums of A002055.at n=6A177452
• G.f. A(x) satisfies A(x) = 1 + Sum_{n>=1} A(x)^n * x^n*(1 + x^n)^n.at n=10A194691
• Matula-Goebel numbers of transitive rooted identity trees (or transitive finitary sets).at n=24A290760
• Products of 5 distinct primes that are sandwiched between squarefree semiprime numbers.at n=42A376949
• a(n) = Sum_{k=0..n} binomial(n+k-1,k) * |Stirling1(n,k)| * k!.at n=5A382830