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 A208324 Triangle T(n,k), read by rows, given by (2, -1/2, 1/2, 0, 0, 0, 0, 0, 0, 0, ...) DELTA (4, -2, 0, 0, 0, 0, 0, 0, 0, 0, ...) where DELTA is the operator defined in A084938. 0
 1, 2, 4, 3, 10, 8, 4, 18, 28, 16, 5, 28, 64, 72, 32, 6, 40, 120, 200, 176, 64, 7, 54, 200, 440, 576, 416, 128, 8, 70, 308, 840, 1456, 1568, 960, 256, 9, 88, 448, 1456, 3136, 4480, 4096, 2176, 512, 10, 108, 624, 2352, 6048, 10752, 13056, 10368, 4864 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are A134931(n). Diagonal sums are A140253(n). Compare this sequence with A207627. Column k is divisible by 2^k. LINKS FORMULA T(n,0) = n+1. T(n,1) = 2*T(n,0) + T(n-1,1). T(n,k) = 2*T(n-1,k-1) + T(n-1,k) for k>1. T(n,k) = 2*T(n-1,k) + 2*T(n-1,k-1) - T(n-2,k) - 2*T(n-2,k-1) with T(0,0) = 1, T(1,0) = 2, T(1,1) = 4. G.f.: (1+2*y*x)/(1-2*(1+y)*x+(1+2*y)*x^2). EXAMPLE Triangle begins : 1 2, 4 3, 10, 8 4, 18, 28, 16 5, 28, 64, 72, 32 6, 40, 120, 200, 176, 64 7, 54, 200, 440, 576, 416, 128 8, 70, 308, 840, 1456, 1568, 960, 256 9, 88, 448, 1456, 3136, 4480, 4096, 2176, 512 10, 108, 624, 2352, 6048, 10752, 13056, 10368, 4864, 1024 CROSSREFS Cf. A207627 Sequence in context: A226367 A324934 A240271 * A277416 A064691 A247071 Adjacent sequences:  A208321 A208322 A208323 * A208325 A208326 A208327 KEYWORD easy,nonn,tabl AUTHOR Philippe Deléham, Feb 25 2012 STATUS approved

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Last modified May 26 11:08 EDT 2022. Contains 354086 sequences. (Running on oeis4.)