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

Author

Amarnath Murthy, Apr 01 2003

Keywords

• base
• easy
• nonn

Links

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

Crossrefs

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

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)

Extensions

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