50699

Appears in sequences

• Number of n-node unrooted steric quartic trees; number of n-carbon alkanes C(n)H(2n+2) taking stereoisomers into account.at n=16A000628
• Numbers k that divide 6^k + 5^k.at n=13A045595
• Numbers n such that sigma(n) and d(n) are both harmonic (Ore) numbers.at n=11A071767
• a(1)=0; thereafter a(2k)=k+a(k), a(2k+1)=k+a(6k+4).at n=26A271473