A134508 Row sums of triangle A134507.
1, 2, 5, 11, 22, 42, 77, 138, 243, 423, 730, 1252, 2137, 3634, 6161, 10419, 17582, 29614, 49797, 83610, 140191, 234767, 392690, 656136, 1095217, 1826402, 3043037, 5065883, 8426758, 14006898, 23265725, 38618922, 64062987, 106206519, 175972426
Offset: 1
Examples
a(4) = 11 = sum of row 4 terms of triangle A134507 = (4 + 5 + 1 + 1). a(4) = 11 = A000071(6) + A029907(4) - 4 = (7 + 8 - 4).
Links
- Index entries for linear recurrences with constant coefficients, signature (4,-4,-2,4,0,-1).
Programs
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PARI
a(n)=fibonacci(n+2) + ((n+4)*fibonacci(n)+2*n*fibonacci(n-1))/5 - n - 1 \\ Charles R Greathouse IV, Feb 13 2018
Formula
Extensions
More terms from Charles R Greathouse IV, Feb 13 2018