a(n) = 2*a(n-1) - a(n-3) + 2*a(floor(n/2)) + 3*a(floor(n/3)) + ... + n*a(floor(n/n)), where a(0) = 1, a(1) = 2, a(2) = 3.

A298409

a(n) = 2*a(n-1) - a(n-3) + 2*a(floor(n/2)) + 3*a(floor(n/3)) + ... + n*a(floor(n/n)), where a(0) = 1, a(1) = 2, a(2) = 3.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =15a(4) =48a(5) =123a(6) =300a(7) =635a(8) =1316a(9) =2555a(10) =4873a(11) =8850a(12) =16096a(13) =28296a(14) =49424a(15) =84749a(16) =144733a(17) =243607a(18) =409156a(19) =680308a(20) =1128889a(21) =1861633a(22) =3063978a(23) =5020133a(24) =8217296a(25) =13409702a(26) =21862824a(27) =35575784a(28) =57853195a(29) =93954953

External references