24634
domain: N
Appears in sequences
- a(n) = 2*a(n-1) + a(n-3), with a(0)=1 and a(1)=2.at n=13A008998
- Numbers k that divide 4^k + 4.at n=16A015889
- Pisot sequences E(4,9), P(4,9).at n=11A020708
- a(n) = 2*prime(n)*prime(n+1).at n=28A069486
- Numbers n such that n*359# +-1 are twin primes, where 359# = 72nd primorial (A002110(72)).at n=21A087907
- Duplicate of A008998.at n=14A141016
- Number of binary words of length n containing at least one subword 101 and no subword 11.at n=21A143281
- If n <= 5 then a(n) = 1, if 6 <= n <= 8 then 2, if n = 9 or 10 then 3, if n = 11, 12 or 13 then n-7; otherwise a(n) = 2*a(n - 4) + a(n - 12).at n=54A239905
- Number of C&C Family matchings on n edges.at n=8A256334
- G.f.: Sum_{n>=0} (n+1)*(n+2)/2 * x^n * (1 + x^n)^n.at n=51A326003
- a(n) is the numerator of Catalan-Daehee number d(n).at n=6A344849
- a(1) = 12; for n >= 2, a(n) = least positive integer of the form prime(m)*prime(n-m)*prime(n) with m >= 1.at n=29A364434