2622000

Appears in sequences

• Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives j values.at n=16A053677
• a(n) = binomial(n+3,3)*binomial(n+8,3).at n=17A104677