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 A172040 Triangle T(n,k), read by rows, given by [0,1,2,1,2,1,2,1,2,1,2,...] DELTA [2,0,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. 0
 1, 0, 2, 0, 2, 4, 0, 6, 8, 8, 0, 22, 28, 24, 16, 0, 90, 112, 96, 64, 32, 0, 394, 484, 416, 288, 160, 64, 0, 1806, 2200, 1896, 1344, 800, 384, 128, 0, 8558, 10364, 8952, 6448, 4000, 2112, 896, 256, 0, 41586, 50144, 43392, 31616, 20160, 11264, 5376, 2048, 512, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Riordan array (1, 2x*f(x)) where f(x) is the g.f. of A001003 . Riordan production matrix is : (0, (2-x)/(1-x)). LINKS Table of n, a(n) for n=0..55. FORMULA Sum_[k, 0<=k<=n} T(n,k)= A006318(n). EXAMPLE Triangle begins : 1 ; 0,2 ; 0,2,4 ; 0,6,8,8 ; 0,22,28,24,16 ; ... CROSSREFS Cf. A104219, A108891 Sequence in context: A137320 A263399 A143507 * A317327 A120557 A092594 Adjacent sequences: A172037 A172038 A172039 * A172041 A172042 A172043 KEYWORD nonn,tabl AUTHOR Philippe Deléham, Jan 23 2010 STATUS approved

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Last modified June 13 22:21 EDT 2024. Contains 373391 sequences. (Running on oeis4.)