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A154690 Triangle read by rows: T(n,m) = (2^(n-m) + 2^m)*binomial(n,m), 0 <= m <= n. 6
2, 3, 3, 5, 8, 5, 9, 18, 18, 9, 17, 40, 48, 40, 17, 33, 90, 120, 120, 90, 33, 65, 204, 300, 320, 300, 204, 65, 129, 462, 756, 840, 840, 756, 462, 129, 257, 1040, 1904, 2240, 2240, 2240, 1904, 1040, 257, 513, 2322, 4752, 6048, 6048, 6048, 6048, 4752, 2322, 513 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Row sums are A025192(n+1).
LINKS
A. Lakhtakia, R. Messier, V. K. Varadan, V. V. Varadan, Use of combinatorial algebra for diffusion on fractals, Physical Review A, volume 34, Number 3 (1986) p. 2502, Fig. 3.
FORMULA
T(n,m) = A007318(n,m)*(2^(n-m) + 2^m).
EXAMPLE
2;
3, 3;
5, 8, 5;
9, 18, 18, 9;
17, 40, 48, 40, 17;
33, 90, 120, 120, 90, 33;
65, 204, 300, 320, 300, 204, 65;
129, 462, 756, 840, 840, 756, 462, 129;
257, 1040, 1904, 2240, 2240, 2240, 1904, 1040, 257;
513, 2322, 4752, 6048, 6048, 6048, 6048, 4752, 2322, 513;
1025, 5140, 11700, 16320, 16800, 16128, 16800, 16320, 11700, 5140, 1025;
MAPLE
A154690 := proc(n, m) binomial(n, m)*(2^(n-m)+2^m) ; end proc: # R. J. Mathar, Jan 13 2011
MATHEMATICA
t[n_, m_] := (2^(n - m) + 2^m) Binomial[n, m]; Table[ t[n, m], {n, 0, 9}, {m, 0, n}] // Flatten
(* alternate program *)
Table[Table[ Sum[Binomial[n, m]*Binomial[m, k] + Binomial[n, n - m]*Binomial[m, m - k], {k, 0, n}]/2, {m, 0, n}]
+ Reverse[ Table[Sum[ Binomial[n, m]*Binomial[m, k] + Binomial[n, n - m]*Binomial[m, m - k], {k, 0, n}]/2, {m, 0, n}]], {n, 0, 10}] (* Roger L. Bagula, Oct 14 2010 *)
CROSSREFS
Cf. A025192.
Sequence in context: A295379 A295352 A295606 * A046937 A247309 A069831
KEYWORD
nonn,tabl,easy
AUTHOR
STATUS
approved

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Last modified May 26 08:25 EDT 2024. Contains 372813 sequences. (Running on oeis4.)