A028357 Partial sums of A028356.
1, 3, 6, 10, 13, 15, 16, 18, 21, 25, 28, 30, 31, 33, 36, 40, 43, 45, 46, 48, 51, 55, 58, 60, 61, 63, 66, 70, 73, 75, 76, 78, 81, 85, 88, 90, 91, 93, 96, 100, 103, 105, 106, 108, 111, 115, 118, 120, 121, 123, 126
Offset: 0
Links
- Index entries for linear recurrences with constant coefficients, signature (2,-1,-1,2,-1).
Crossrefs
Cf. A047401. - Jeremy Gardiner, Jul 20 2013.
Formula
G.f.: ( 1+x+2*x^3+x^2 ) / ( (1+x)*(x^2-x+1)*(x-1)^2 ). - R. J. Mathar, Dec 15 2015