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 A062253 2nd level triangle related to Eulerian numbers and binomial transforms (triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level). 5
 1, 3, 0, 7, 4, 0, 15, 30, 5, 0, 31, 146, 91, 6, 0, 63, 588, 868, 238, 7, 0, 127, 2136, 6126, 4096, 575, 8, 0, 255, 7290, 36375, 47400, 16929, 1326, 9, 0, 511, 23902, 193533, 434494, 306793, 64362, 2971, 10, 0, 1023, 76296, 956054, 3421902, 4169418 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Binomial transform of n^2*k^n is ((kn)^2 + kn)*(k + 1)^(n - 2); of n^3*k^n is ((kn)^3 + 3(kn)^2 + (1 - k)(kn))*(k + 1)^(n - 3); of n^4*k^n is ((kn)^4 + 6(kn)^3 + (7 - 4k)(kn)^2 + (1 - 4k + k^2)(kn))*(k + 1)^(n - 4); of n^5*k^n is ((kn)^5 + 10(kn)^4 + (25 - 10k)(kn)^3 + (15 - 30k + 5k^2)(kn)^2 + (1 - 11k + 11k^2 - k^3)(kn))*(k + 1)^(n - 5); of n^6*k^n is ((kn)^6 + 15(kn)^5 + (65 - 20k)(kn)^4 + (90 - 120k + 15k^2)(kn)^3 + (31 - 146k + 91k^2 - 6k^3)(kn)^2 + (1 - 26k + 66k^2 - 26k^3 + k^4)(kn))*(k + 1)^(n - 6). This sequence gives the (unsigned) polynomial coefficients of (kn)^2. LINKS FORMULA A(n, k)=(k+2)*A(n-1, k)+(n-k)*A(n-1, k-1)+E(n, k) where E(n, k)=(k+1)*E(n-1, k)+(n-k)*E(n-1, k-1) and E(0, 0)=1 is a triangle of Eulerian numbers, essentially A008292. EXAMPLE Rows start (1), (3,0), (7,4,0), (15,30,5,0) etc. CROSSREFS First column is A000225. Diagonals include A000007, A009056. Row sums are A000254. Taking all the levels together to create a pyramid, one face would be A010054 as a triangle with a parallel face which is Pascal's triangle (A007318) with two columns removed, another face would be a triangle of Stirling numbers of the second kind (A008277) and a third face would be A000007 as a triangle, with a triangle of Eulerian numbers (A008292), A062253, A062254 and A062255 as faces parallel to it. The row sums of this last group would provide a triangle of unsigned Stirling numbers of the first kind (A008275). Sequence in context: A199667 A181163 A098867 * A290844 A322018 A200339 Adjacent sequences:  A062250 A062251 A062252 * A062254 A062255 A062256 KEYWORD nonn,tabl AUTHOR Henry Bottomley, Jun 14 2001 STATUS approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)