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 A201947 Triangle T(n,k), read by rows, given by (1,1,-1,0,0,0,0,0,0,0,...) DELTA (1,-1,1,0,0,0,0,0,0,...) where DELTA is the operator defined in A084938. 1
 1, 1, 1, 2, 2, 0, 3, 5, 1, -1, 5, 10, 4, -2, -1, 8, 20, 12, -4, -4, 0, 13, 38, 31, -4, -13, -2, 1, 21, 71, 73, 3, -33, -11, 3, 1, 34, 130, 162, 34, -74, -42, 6, 6, 0, 55, 235, 344, 128, -146, -130, 0, 24, 3, -1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS Row-reversed variant of A123585. Row sums: 2^n. LINKS FORMULA G.f.: 1/(1-(1+y)*x+(y+1)*(y-1)*x^2). T(n,0) = A000045(n+1). T(n,k) = T(n-1,k) + T(n-1,k-1) + T(n-2,k) - T(n-2,k-2) with T(0,0)= 1 and T(n,k)= 0 if n

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Last modified June 19 12:57 EDT 2021. Contains 345129 sequences. (Running on oeis4.)