A131431 3n + 1 preceded by n zeros.

1, 0, 4, 0, 0, 7, 0, 0, 0, 10, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 0, 0, 0, 0, 22, 0, 0, 0, 0, 0, 0, 0, 0, 25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 37

Offset

0,3

Links

Table of n, a(n) for n=0..90.

Formula

A016777 as the diagonal of an infinite lower triangular matrix with the rest zeros.

Example

First few rows of the triangle are:
1;
0, 4;
0, 0, 7;
0, 0, 0, 10;
0, 0, 0, 0, 13;
...

Maple

ListTools[Flatten]([seq([seq(0, k=1..n), 3*n+1], n=0..12)]); # Georg Fischer, Oct 02 2021

Crossrefs

Cf. A016777, A131432.

Sequence in context: A341795 A063730 A355945 * A240664 A255328 A321433

Adjacent sequences: A131428 A131429 A131430 * A131432 A131433 A131434

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 10 2007

Extensions

a(35) corrected and more terms from Georg Fischer, Oct 02 2021

Status

approved