40327
domain: N
Appears in sequences
- a(n) = [ a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ], for n >= 3.at n=42A022871
- a(n) = (n+1)! + n.at n=7A030495
- Number of series-reduced planted compound windmills with n leaves.at n=11A032203
- Numbers n such that 73*2^n-1 is prime.at n=13A050562
- Sums of nonconsecutive factorial numbers.at n=38A060112
- Number of gap-free compositions of n into distinct parts, cf. A107428.at n=35A107461
- a(n) = floor(((1+sqrt(3))/2)^n).at n=33A125895
- Sequence is obtained from Catalan numbers (A000108) by taking the factorial of each digit and adding them up.at n=12A165163
- Expansion of Product_{k>=1} 1/(1-x^(k+8))^k.at n=52A263364
- Starts of runs of 4 consecutive Gray-code Niven numbers (A344341).at n=34A344344
- Starts of runs of 3 consecutive numbers that have an equal number of even and odd exponents in their prime factorization (A187039).at n=17A348077
- E.g.f. satisfies A(x) = 1 + x*A(x)^2 * (exp(x) - 1).at n=7A371142