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 A156141 Triangle T(n,k) = A008517(n,k+1)+A008517(n,n+1-k) read by rows. 3
 2, 1, 1, 1, 4, 1, 1, 14, 14, 1, 1, 46, 116, 46, 1, 1, 172, 772, 772, 172, 1, 1, 834, 5160, 8800, 5160, 834, 1, 1, 5280, 39594, 90260, 90260, 39594, 5280, 1, 1, 40814, 361086, 981104, 1288040, 981104, 361086, 40814, 1, 1, 363884, 3801180, 12088796 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Row sums are 2*A001147(n). LINKS E. W. Weisstein, Second-Order Eulerian Triangle FORMULA T(n,0)=T(n,n) =1, n>=1. T(n,k)= A008517(n,k+1)+A008517(n,n+1-k), n>1, 0= n; e[n_, k_] := (k + 1)e[n - 1, k] + (2n - k - 1)e[n - 1, k - 1]; Table[Table[e[n, k] + e[n, n - k], {k, 0, n}], {n, 0, 10}]; Flatten[%] CROSSREFS Cf. A008517 Sequence in context: A260757 A157114 A156786 * A174555 A157113 A214712 Adjacent sequences:  A156138 A156139 A156140 * A156142 A156143 A156144 KEYWORD nonn,tabl AUTHOR Roger L. Bagula, Feb 04 2009 EXTENSIONS Definition simplified by the Associate Editors of the OEIS Sep 17 2009 STATUS approved

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Last modified March 20 09:35 EDT 2019. Contains 321345 sequences. (Running on oeis4.)