a(n) = 4*a(n-1) - 2*a(n-2) + a(n-3) - 4*a(n-4) + a(n-5) for n >= 6, where a(1) = 1, a(2) = 3, a(3) = 5, a(4) = 16, a(5) = 53.

A339828

a(n) = 4*a(n-1) - 2*a(n-2) + a(n-3) - 4*a(n-4) + a(n-5) for n >= 6, where a(1) = 1, a(2) = 3, a(3) = 5, a(4) = 16, a(5) = 53.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =16a(4) =53a(5) =179a(6) =610a(7) =2081a(8) =7103a(9) =24250a(10) =82793a(11) =282671a(12) =965098a(13) =3295049a(14) =11249999a(15) =38409898a(16) =131139593a(17) =447738575a(18) =1528675114a(19) =5219223305a(20) =17819542991a(21) =60839725354a(22) =207719815433a(23) =709199811023

External references