Number of -n..n arrays of 7 elements with first, second and third differences also in -n..n.
A202128
Number of -n..n arrays of 7 elements with first, second and third differences also in -n..n.
Terms
- a(0) =47a(1) =1517a(2) =15101a(3) =85771a(4) =345241a(5) =1104357a(6) =2993875a(7) =7169025a(8) =15586785a(9) =31358615a(10) =59213403a(11) =106061265a(12) =181644529a(13) =299379215a(14) =477297063a(15) =739082975a(16) =1115418273a(17) =1645395261a(18) =2378011923a(19) =3374165639a(20) =4708618657a(21) =6472020879a(22) =8773706563
External references
- oeis: A202128