A066631 The sequence f(1), f(2), ... as defined in A068192.

4, 8, 24, 120, 840, 9240, 120120, 2042040, 38798760, 1202761560, 34880085240, 802241960520, 32891920381320, 1414352576396760, 52331045326680120, 4657463034074530680, 274790319010397310120, 14563886907551057436360

Offset: 1

Author

N. J. A. Sloane, Jun 10 2002

Keywords

• nonn

Crossrefs

Cf. A068192.

Programs

PARI

{a=4; for(n=1,18,print1(a,","); b=a-precprime(a-2); a=a*b)}

Extensions

Edited by Dean Hickerson and Klaus Brockhaus, Jun 10 2002