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A123316 Triangle read by rows: T(n,k)=(k+1)*n!/2 (1<=k<=n). 0
1, 2, 3, 6, 9, 12, 24, 36, 48, 60, 120, 180, 240, 300, 360, 720, 1080, 1440, 1800, 2160, 2520, 5040, 7560, 10080, 12600, 15120, 17640, 20160, 40320, 60480, 80640, 100800, 120960, 141120, 161280, 181440, 362880, 544320, 725760, 907200, 1088640 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..41.

EXAMPLE

Triangle begins:

{1},

{2, 3},

{6, 9, 12},

{24, 36, 48, 60},

{120, 180, 240, 300, 360},

{720, 1080, 1440, 1800, 2160, 2520},

{5040, 7560, 10080, 12600, 15120, 17640, 20160}

MAPLE

T:=(n, k)->(k+1)*n!/2: for n from 1 to 10 do seq(T(n, k), k=1..n) od; # yields sequence in triangular form

MATHEMATICA

t[n_, m_] := (m + 1)*n!/2; a = Table[Table[t[n, m], {m, 1, n}], {n, 1, 10}]; Flatten[a]

CROSSREFS

Cf. A051683.

Sequence in context: A261539 A325552 A271882 * A303365 A096845 A285084

Adjacent sequences:  A123313 A123314 A123315 * A123317 A123318 A123319

KEYWORD

nonn,tabl

AUTHOR

Roger L. Bagula, Nov 09 2006

EXTENSIONS

Edited by N. J. A. Sloane, Dec 03 2006

STATUS

approved

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Last modified January 25 03:49 EST 2020. Contains 331241 sequences. (Running on oeis4.)