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A014410 Elements in Pascal's triangle (by row) that are not 1.

%I A014410 #61 Oct 27 2023 22:00:43
%S A014410 2,3,3,4,6,4,5,10,10,5,6,15,20,15,6,7,21,35,35,21,7,8,28,56,70,56,28,
%T A014410 8,9,36,84,126,126,84,36,9,10,45,120,210,252,210,120,45,10,11,55,165,
%U A014410 330,462,462,330,165,55,11,12,66,220,495,792,924,792,495,220,66,12,13,78
%N A014410 Elements in Pascal's triangle (by row) that are not 1.
%C A014410 Also, rows of triangle formed using Pascal's rule except begin and end n-th row with n+2. - _Asher Auel_.
%C A014410 Row sums are A000918. - _Roger L. Bagula_ and _Gary W. Adamson_, Jan 15 2009
%C A014410 Given the triangle signed by rows (+ - + ...) = M, with V = a variant of the Bernoulli numbers starting [1/2, 1/6, 0, -1/30, 0, 1/42, ...]; M*V = [1, 1, 1, ...]. - _Gary W. Adamson_, Mar 05 2012
%C A014410 Also A014410 * [1/2, 1/6, 0, -1/30, 0, 1/42, 0, ...] = [1, 2, 3, 4, ...]. For an alternative way to derive the Bernoulli numbers from a modified version of Pascal's triangle see A135225. - _Peter Bala_, Dec 18 2014
%C A014410 T(n,k) mod n = A053201(n,k), k=1..n-1. - _Reinhard Zumkeller_, Aug 17 2013
%C A014410 From _Wolfdieter Lang_, May 22 2015: (Start)
%C A014410 This is Johannes Scheubel's (1494-1570) (also Scheybl, Schöblin) version of the arithmetical triangle from his 1545 book "De numeris et diversis rationibus". See the Kac reference, p. 396 and the Table 12.1 on p. 395.
%C A014410 The row sums give 2*A000225(n-1) = A000918(n) = 2*(2^n - 1), n >= 2. (See the second comment above).
%C A014410 The alternating row sums give repeat(2,0) = 2*A059841(n), n >= 2. (End)
%C A014410 T(n+1,k) is the number of k-facets of the n-simplex. - _Jianing Song_, Oct 22 2023
%D A014410 Victor J. Kac, A History of Mathematics, third edition, Addison-Wesley, 2009, pp. 395, 396.
%H A014410 Reinhard Zumkeller, <a href="/A014410/b014410.txt">Rows n=2..150 of triangle, flattened</a>
%H A014410 Carl McTague, <a href="http://arxiv.org/abs/1510.06696">On the Greatest Common Divisor of binomial(qn, q), binomial(qn,2q), ..., binomial(qn, qn-q)</a>, arXiv:1510.06696 [math.CO], 2015.
%H A014410 Wikipedia, <a href="https://de.wikipedia.org/wiki/Johann_Scheubel">Johannes Scheubel</a> (in German).
%H A014410 Wikipedia, <a href="https://en.wikipedia.org/wiki/Simplex">Simplex</a>
%F A014410 T(n,k) = binomial(n,k) = A007318(n,k), n >= 2, k = 1, 2, ..., n-1.
%F A014410 a(n) = C(A003057(n),A002260(n)) = C(A003057(n),A004736(n)). - _Lekraj Beedassy_, Jul 29 2006
%F A014410 T(n,k) = A028263(n,k) - A007318(n,k). - _Reinhard Zumkeller_, Mar 12 2012
%F A014410 gcd_{k=1..n-1} T(n, k) = A014963(n), see Theorem 1 of McTague link. - _Michel Marcus_, Oct 23 2015
%e A014410 The triangle T(n,k) begins:
%e A014410 n\k  1  2   3   4    5    6    7    8   9  10 11
%e A014410 2:   2
%e A014410 3:   3  3
%e A014410 4:   4  6   4
%e A014410 5:   5 10  10   5
%e A014410 6:   6 15  20  15    6
%e A014410 7:   7 21  35  35   21    7
%e A014410 8:   8 28  56  70   56   28    8
%e A014410 9:   9 36  84 126  126   84   36    9
%e A014410 10: 10 45 120 210  252  210  120   45  10
%e A014410 11: 11 55 165 330  462  462  330  165  55  11
%e A014410 12: 12 66 220 495  792  924  792  495 220  66 12
%e A014410 ... reformatted. - _Wolfdieter Lang_, May 22 2015
%p A014410 for i from 0 to 12 do seq(binomial(i, j)*1^(i-j), j = 1 .. i-1) od; # _Zerinvary Lajos_, Dec 02 2007
%t A014410 Select[ Flatten[ Table[ Binomial[ n, i ], {n, 0, 13}, {i, 0, n} ] ], #>1& ]
%o A014410 (Haskell)
%o A014410 a014410 n k = a014410_tabl !! (n-2) !! (k-1)
%o A014410 a014410_row n = a014410_tabl !! (n-2)
%o A014410 a014410_tabl = map (init . tail) $ drop 2 a007318_tabl
%o A014410 -- _Reinhard Zumkeller_, Mar 12 2012
%Y A014410 Cf. A007318, A000918, A027641.
%Y A014410 A180986 is the same sequence but regarded as a square array.
%Y A014410 Cf. A000225,A059841, A257241 (Stifel's version).
%K A014410 nonn,easy,tabl
%O A014410 2,1
%A A014410 _Mohammad K. Azarian_
%E A014410 More terms from _Erich Friedman_