a(n) = f(n,n) where f(m,n) = max(m,n) if m < 2 or n < 2; f(m,n) = f(m-1,n-1) + f(m-1,n-2) + f(m-2,n-1) otherwise. Diagonal of A342859.

A342600

a(n) = f(n,n) where f(m,n) = max(m,n) if m < 2 or n < 2; f(m,n) = f(m-1,n-1) + f(m-1,n-2) + f(m-2,n-1) otherwise. Diagonal of A342859.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =7a(4) =17a(5) =39a(6) =91a(7) =211a(8) =487a(9) =1123a(10) =2589a(11) =5963a(12) =13725a(13) =31583a(14) =72661a(15) =167131a(16) =384377a(17) =883951a(18) =2032723a(19) =4674299a(20) =10748631a(21) =24716955a(22) =56839003a(23) =130710843a(24) =300603331a(25) =691345931a(26) =1590077703a(27) =3657329539a(28) =8412668791a(29) =19352107787

External references