Number of 0..4 arrays x(0..n-1) of n elements with zero n-1st difference.

A200150

Number of 0..4 arrays x(0..n-1) of n elements with zero n-1st difference.

Terms

    a(0) =1a(1) =5a(2) =13a(3) =41a(4) =103a(5) =275a(6) =685a(7) =2525a(8) =5221a(9) =13897a(10) =32717a(11) =176145a(12) =321963a(13) =1390895a(14) =2223445a(15) =3845743a(16) =10539177a(17) =76756525a(18) =147653093a(19) =808935605a(20) =934179307

External references