A079811 Sum of numbers read upward at a 45-degree angle in A079809.

1, 2, 2, 6, 7, 10, 10, 18, 19, 24, 24, 36, 37, 44, 44, 60, 61, 70, 70, 90, 91, 102, 102, 126, 127, 140, 140, 168, 169, 184, 184, 216, 217, 234, 234, 270, 271, 290, 290, 330, 331, 352, 352, 396, 397, 420, 420, 468, 469, 494, 494, 546, 547, 574, 574, 630, 631

Offset

1,2

Links

Table of n, a(n) for n=1..57.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,2,-2,0,0,-1,1).

Formula

From Elmo R. Oliveira, May 06 2026: (Start)

a(n) = a(n-1) + 2*a(n-4) - 2*a(n-5) - a(n-8) + a(n-9) for n > 9.

G.f.: x*(1 + x + 4*x^3 - x^4 + x^5) / ((1 - x)^3*(1 + x)^2*(1 + x^2)^2). (End)

Crossrefs

Cf. A079808, A092542.

The two bisections are A309805 and twice A211538 (with leading zeros dropped).

Sequence in context: A011145 A177852 A338837 * A097869 A298079 A295783

Adjacent sequences: A079808 A079809 A079810 * A079812 A079813 A079814

Keyword

easy,nonn

Author

Amarnath Murthy, Feb 10 2003

Extensions

Terms a(8) and beyond from Andrei Zabolotskii, Jan 18 2024

Status

approved