Number of third differences of arrays of length 5 of numbers in 0..n.

Terms

a(0) =31a(1) =143a(2) =319a(3) =565a(4) =881a(5) =1267a(6) =1723a(7) =2249a(8) =2845a(9) =3511a(10) =4247a(11) =5053a(12) =5929a(13) =6875a(14) =7891a(15) =8977a(16) =10133a(17) =11359a(18) =12655a(19) =14021a(20) =15457a(21) =16963a(22) =18539a(23) =20185a(24) =21901a(25) =23687a(26) =25543a(27) =27469a(28) =29465a(29) =31531