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A100948 Irregular triangle with T(n,1) = floor(n!/3), T(n,2) = n!/2, T(n,3) = n!, read by rows. 1
1, 1, 2, 2, 3, 6, 8, 12, 24, 40, 60, 120, 240, 360, 720, 1680, 2520, 5040, 13440, 20160, 40320, 120960, 181440, 362880, 1209600, 1814400, 3628800 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..28.

FORMULA

T(n,1) = A002301(n), n>=3. T(n,2) = A001710(n). T(n,3) = A000142(n).

EXAMPLE

1, 1, 2;

2, 3, 6;

8, 12, 24;

40, 60, 120;

240, 360, 720;

1680, 2520, 5040;

13440, 20160, 40320;

120960, 181440, 362880;

1209600, 1814400, 3628800;

MATHEMATICA

Flatten[Table[{If[n < 3, 1, n!/3], If[n < 2, 1, n!/2], n!}, {n, 1, 10}]]

CROSSREFS

Sequence in context: A300352 A035587 A039870 * A035571 A079069 A019465

Adjacent sequences:  A100945 A100946 A100947 * A100949 A100950 A100951

KEYWORD

nonn,tabf,easy

AUTHOR

Roger L. Bagula, Jun 07 2007

STATUS

approved

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Last modified December 2 02:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)