A377748 a(n) = (A000217(n) - A005132(n))/2.

0, 0, 0, 0, 4, 4, 4, 4, 12, 12, 22, 22, 34, 34, 48, 48, 64, 64, 64, 64, 84, 84, 106, 129, 129, 154, 154, 181, 181, 210, 210, 241, 241, 241, 241, 276, 276, 313, 351, 351, 391, 391, 433, 433, 477, 477, 523, 523, 571, 571, 621, 621, 673, 673, 727, 727, 783, 783, 841, 841

Offset

0,5

Comments

a(n) is the sum of the down steps in the first n terms of Recamán's sequence A005132.

Links

Table of n, a(n) for n=0..59.

Index entries for sequences related to Recamán's sequence

Formula

a(n) = Sum_{k=1..n} max(0, -A160356(k)).

Example

a(0) = (0-0)/2, a(1) = (1-1)/2, a(2) = (3-3)/2, a(3) = (6-6)/2, a(4) = (10-2)/2, a(5) = (15-7)/2 ... .

Crossrefs

Cf. A000217, A005132, A160356.

Sequence in context: A190718 A035621 A046109 * A294246 A107680 A358509

Adjacent sequences: A377745 A377746 A377747 * A377749 A377750 A377751

Keyword

nonn

Author

Paul Curtz, Nov 06 2024

Status

approved