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

A298407

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

Terms

    a(0) =1a(1) =2a(2) =3a(3) =9a(4) =23a(5) =52a(6) =113a(7) =223a(8) =431a(9) =794a(10) =1442a(11) =2532a(12) =4433a(13) =7589a(14) =12924a(15) =21730a(16) =36411a(17) =60440a(18) =100125a(19) =164816a(20) =270863a(21) =443390a(22) =724846a(23) =1181713a(24) =1925113a(25) =3130488a(26) =5087530a(27) =8258585a(28) =13400782a(29) =21728136

External references