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User talk:Paul Curtz
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Cher Monsieur Curtz,
Je cherche un exemplaire de votre article "Intégration numérique des systèmes différentiels à conditions initiales", cité dans l'enclopédie pour la suite A140825. Si vous pourrez m'aider à l'obtenir, répondez ici ou sur mon page utilisateur.
Je vous remercie, Jack W Grahl, Jack W Grahl (talk) 18:49, 22 February 2021 (EST)
Dera Mr. Curtz, I will use this section do save some of your ideas and comments of database editing which may get lost.
From A013979:
NAME Expansion of 1/(1 - x^2 - x^3 - x^4) = 1/((1 + x)*(1 - x - x^3)).
From Paul Curtz, Aug 18 2021: (Start) Consider the indefinitely repeated diagonal c(n) = 1, 0, 0, A000930(n): 1 0 1 0 0 1 1 0 1 0 1 1 1 0 1 2 0 1 1 3 1 0 1 2 4 0 1 1 3 6 1 0 1 2 4 9 0 1 1 3 6 13 1 0 1 2 4 9 19 0 1 1 3 6 13 28 ... . Row sums = a(n). Diagonal or antidiagonal sums = A000930(n) (End)
12:55 Paul Curtz: b(n) = 1, 1, A006212(n) for the same transform (triangle). Every dia: 1; 1; 1, 0; 1, 1; 1, 0, 4; 1, 1, 14; 1, 0, 4, 56; 1, 1, 14, 256; 1, 0, 4, 56, 1324; ... . Every diagonal is b(n). Row sums: A000111(n). Diagonal or antidiagonal sums: c(n) = 1, 2, 2, 3, 7, 21, 77, 333, ... . 13:11 Paul Curtz: Delete Every dia in the last comment. This comment gives an idea of the interest of the transform. c(n+1) - c(n) = 1, 0, 1, 4, 14, 56, 256, 1324,