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 A217943 Triangle read by rows: T(n,k) = 2*C(n-1,k)-C(n,k) for k
 2, -2, 0, 2, -2, 2, -2, 2, -2, 0, 0, 0, 2, -2, 4, -2, -2, 0, 2, -2, 0, 0, 0, 0, 0, 2, -2, 6, -6, 2, -2, 0, 0, 2, -2, 0, 6, -6, 0, 0, 0, 0, 2, -2, 10, -10, 0, 2, -2, 0, 0, 0, 2, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -2, 20, -10, -4, -6, 2, -2, 0, 0, 0, 0, 2, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, arXiv:1212.6102, Dec 25 2012. B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, Journal of Integer Sequences, Vol. 16 (2013), Article 13.4.3. N. J. A. Sloane, Rows 2 through 48 of A217943 EXAMPLE Triangle begins: [2, -2] [0, 2, -2] [2, -2, 2, -2] [0, 0, 0, 2, -2] [4, -2, -2, 0, 2, -2] [0, 0, 0, 0, 0, 2, -2] [6, -6, 2, -2, 0, 0, 2, -2] [0, 6, -6, 0, 0, 0, 0, 2, -2] [10, -10, 0, 2, -2, 0, 0, 0, 2, -2] [0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -2] [20, -10, -4, -6, 2, -2, 0, 0, 0, 0, 2, -2] ... CROSSREFS Cf. A216955. The nonzero entries in the first column form A216958. Sequence in context: A029310 A134131 A127527 * A177225 A236306 A153239 Adjacent sequences:  A217940 A217941 A217942 * A217944 A217945 A217946 KEYWORD sign,tabf AUTHOR N. J. A. Sloane, following a suggestion from Allan Wilks, Oct 25 2012 STATUS approved

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Last modified January 20 12:03 EST 2019. Contains 319330 sequences. (Running on oeis4.)