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A178821
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Triangle read by rows: T(n,k) = binomial(n+4,4) * binomial(n,k), 0 <= k <= n.
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3
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1, 5, 5, 15, 30, 15, 35, 105, 105, 35, 70, 280, 420, 280, 70, 126, 630, 1260, 1260, 630, 126, 210, 1260, 3150, 4200, 3150, 1260, 210, 330, 2310, 6930, 11550, 11550, 6930, 2310, 330, 495, 3960, 13860, 27720, 34650, 27720, 13860, 3960, 495, 715, 6435, 25740, 60060, 90090, 90090, 60060, 25740, 6435, 715
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OFFSET
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0,2
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COMMENTS
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The product of the pentatope numbers (A000332, beginning with fifth term) and Pascal's triangle (A007318). Also level 5 of Pascal's prism (A178819) read by rows: (i+4; 4, i-j, j), i >= 0, 0 <= j <= i.
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LINKS
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H. J. Brothers, Pascal's prism, The Mathematical Gazette, 96 (July 2012), 213-220.
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FORMULA
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T(n,k) = C(n+4,4) * C(n,k), 0 <= k <= n.
For element a in A178819: a_(5, i, j) = (i+3; 4, i-j, j-1), i >= 1, 1 <= j <= i.
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EXAMPLE
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Triangle begins:
1;
5, 5;
15, 30, 15;
35, 105, 105, 35;
70, 280, 420, 280, 70;
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MAPLE
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T:=(n, k)->binomial(n+4, 4)*binomial(n, k): seq(seq(T(n, k), k=0..n), n=0..9); # Muniru A Asiru, Jan 22 2019
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MATHEMATICA
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Table[Multinomial[4, i-j, j], {i, 0, 9}, {j, 0, i}]//Column
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PROG
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(Magma) /* As triangle */ [[Binomial(n+4, 4)*Binomial(n, k): k in [0..n]]: n in [0.. 10]]; // Vincenzo Librandi, Oct 23 2017
(PARI) {T(n, k) = binomial(n+4, 4)*binomial(n, k)}; \\ G. C. Greubel, Jan 22 2019
(Sage) [[binomial(n+4, 4)*binomial(n, k) for k in (0..n)] for n in (0..10)] # G. C. Greubel, Jan 22 2019
(GAP) T:=Flat(List([0..10], n-> List([0..n], k-> Binomial(n+4, 4)* Binomial(n, k) ))); # G. C. Greubel, Jan 22 2019
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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