A178419 Partial sums of A006431.

0, 1, 3, 6, 11, 17, 24, 32, 43, 57, 72, 95, 119, 151, 207, 303, 431, 655, 1039, 1551, 2447, 3983, 6031, 9615, 15759, 23951, 38287, 62863, 95631, 152975, 251279, 382351, 611727, 1004943, 1529231, 2446735, 4019599, 6116751, 9786767, 16078223

Offset: 1

Author

Jonathan Vos Post, May 27 2010

Keywords

• nonn
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (1,0,4,-4).

Crossrefs

Cf. A006431.

Formula

a(n) = Sum_{i=1..n} A006431(i).

G.f.: -x^2*(36*x^13 +28*x^12 +32*x^11 +21*x^10 +17*x^9 +14*x^8 +13*x^7 +12*x^6 +5*x^5 +2*x^4 -x^3 -3*x^2 -2*x -1) / ((x -1)*(4*x^3 -1)). - Colin Barker, Apr 20 2013