A054439 Fourth derivative of n.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 6, 7, 0, 1, 2, 3, 0, 1, 2, 3, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 3, 2, 2, 3, 0, 1, 0, 1, 0, 0, 0

Offset: 0

Author

Henry Bottomley, May 11 2000

Keywords

• nonn

Crossrefs

Cf. A038554, A038570, A038571.

Formula

a(n)=A038554(A038554(A038554(A038554(n))))=A038570(A038570(n))