A117826 First four terms of the sequence are doubled, then those numbers are tripled and then those numbers are quadrupled, etc.

1, 2, 3, 4, 2, 4, 6, 8, 6, 12, 18, 24, 24, 48, 72, 96, 120, 240, 360, 480, 720, 1440, 2160, 2880, 5040, 10080, 15120, 20160, 40320, 80640, 120960, 161280, 362880, 725760, 1088640, 1451520, 3628800, 7257600, 10886400, 14515200, 39916800, 79833600

Offset

1,2

Links

Table of n, a(n) for n=1..42.

Formula

a(4n-3) = A000142(n). a(4n-2)=2*A000142(n)=A052849(n), a(4n-1)=3*A000142(n)=A052560(n), a(4n)=4*A000142(n)=2*A052849(n)=A052578(n).

Mathematica

Table[n!{1, 2, 3, 4}, {n, 11}] // Flatten

Crossrefs

Cf. A000142, A115425.

Sequence in context: A107572 A043264 A268444 * A322604 A173229 A366296

Adjacent sequences: A117823 A117824 A117825 * A117827 A117828 A117829

Keyword

nonn

Author

Robert G. Wilson v, Apr 25 2006

Status

approved