21374

Appears in sequences

• Number of irreducible positions of size n in Montreal solitaire.at n=10A007049
• Number of points in N^6 of norm <= n.at n=7A055405
• Number of points in N^n of norm <= 7.at n=6A055422
• G.f.: A(x) = 1/[1-x - Sum_{n>=1} A001147(n)*x^(2n) ] where A001147(n) = (2n)!/(n!*2^n) is the double factorials.at n=12A124495
• Expansion of Sum_{k>=1} x^k*(1 + x^k)/(1 - x^k)^4.at n=38A320941
• Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=37A346135
• a(n) is the number of multisets of n positive decimal digits where the sum of the digits equals the product of the prime digits.at n=44A384505