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A181854 Triangle read by rows: Partial row sums of A181853(n,k) 5
1, 1, 2, 1, 4, 6, 1, 7, 18, 24, 1, 11, 42, 76, 88, 1, 16, 97, 286, 468, 528, 1, 22, 163, 556, 1050, 1332, 1392, 1, 29, 317, 1697, 4942, 8682, 10716, 11136, 1, 37, 493, 3209, 11502, 24770, 36108, 41016, 41856 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
EXAMPLE
[0] 1
[1] 1 2
[2] 1 4 6
[3] 1 7 18 24
[4] 1 11 42 76 88
[5] 1 16 97 286 468 528
[6] 1 22 163 556 1050 1332 1392
MAPLE
with(combstruct):
a181854_row := proc(n) local k, L, l, R, comb;
R := NULL; L := 0;
for k from 0 to n do
comb := iterstructs(Combination(n), size=k):
while not finished(comb) do
l := nextstruct(comb);
L := L + ilcm(op(l));
od;
R := R, L;
od;
R end:
MATHEMATICA
t[_, 0] = 1; t[n_, k_] := Sum[LCM @@ c, {c, Subsets[Range[n], {k}]}]; row[n_] := Table[t[n, k], {k, 0, n}] // Accumulate; Table[row[n], {n, 0, 8}] // Flatten (* Jean-François Alcover, Jul 30 2013 *)
CROSSREFS
Sequence in context: A219441 A219142 A220226 * A109822 A274292 A359670
KEYWORD
nonn,tabl
AUTHOR
Peter Luschny, Dec 06 2010
STATUS
approved

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Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)