a(1) = 1, a(2) = 2, a(3) = 6; a(n) = 5*a(n-1) - 5*a(n-2) + a(n-3) for n > 3.

A101265

a(1) = 1, a(2) = 2, a(3) = 6; a(n) = 5*a(n-1) - 5*a(n-2) + a(n-3) for n > 3.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =21a(4) =77a(5) =286a(6) =1066a(7) =3977a(8) =14841a(9) =55386a(10) =206702a(11) =771421a(12) =2878981a(13) =10744502a(14) =40099026a(15) =149651601a(16) =558507377a(17) =2084377906a(18) =7779004246a(19) =29031639077a(20) =108347552061a(21) =404358569166

External references