A238374 Row sums of triangle in A204026.
1, 2, 4, 6, 9, 12, 17, 22, 30, 38, 51, 64, 85, 106, 140, 174, 229, 284, 373, 462, 606, 750, 983, 1216, 1593, 1970, 2580, 3190, 4177, 5164, 6761, 8358, 10942, 13526, 17707, 21888, 28653, 35418, 46364, 57310, 75021, 92732, 121389, 150046, 196414, 242782
Offset: 0
Examples
Triangle in A204026 begins: 1;.........................sum = 1 1, 1;......................sum = 2 1, 2, 1;...................sum = 4 1, 2, 2, 1;................sum = 6 1, 2, 3, 2, 1;.............sum = 9 1, 2, 3, 3, 2, 1;..........sum = 12 1, 2, 3, 5, 3, 2, 1;.......sum = 17 1, 2, 3, 5, 5, 3, 2, 1;....sum = 22 1, 2, 3, 5, 8, 5, 3, 2, 1;.sum = 30
Links
- Index entries for linear recurrences with constant coefficients, signature (1,1,-1,1,-1).
Programs
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Mathematica
LinearRecurrence[{1,1,-1,1,-1},{1,2,4,6,9},50] (* Harvey P. Dale, Feb 24 2018 *)