A081929 Sum of the n-th row of A077339.

1, 22, 64, 127, 211, 316, 442, 589, 757, 946, 1156, 2467, 3979, 5692, 7606, 9721, 12037, 14554, 17272, 20191, 23311, 26632, 30154, 33877, 37801, 41926, 46252, 50779, 55507, 60436, 65566, 70897, 76429, 82162, 88096, 94231, 100567, 107104

Offset

1,2

Links

Table of n, a(n) for n=1..38.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

Formula

For n>10, a(n) = 1/2 * (201n^2 - 2001n + 2).

From Chai Wah Wu, Jan 12 2023: (Start)

a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n > 13.

G.f.: x*(900*x^12 - 1080*x^11 - x^2 - 19*x - 1)/(x - 1)^3. (End)

Crossrefs

Not the same as A069178 (A069178(12)=1387 <> 2467=a(12) ). Cf. A077339, A077340.

Sequence in context: A051874 A140390 A069178 * A305064 A124715 A126376

Adjacent sequences: A081926 A081927 A081928 * A081930 A081931 A081932

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 01 2003

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003

Status

approved