A129398 -id:A129398 - cp's OEIS frontend

A129399 Level sums of A129398.

1, 9, -11, 33

Offset: 0

Jonas Wallgren, Apr 13 2007

sign

			a(2)=-11 because it is the sum of all elements for h=2 in A129398:
.....1
..1.-3..1
1.-3.-7.-3..1
..1..3..1
.....1

Cf. A129398.

A129392 Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1).

Original entry on oeis.org

1, 1, 3, 1, 1, -5, -7, -5, 1, 1, 7, 5, 3, 5, 7, 1, 1, 3, 1, -9, -15, -9, 1, 3, 1, 1, -33, -35, -5, 29, 43, 29, -5, -35, -33, 1, 1, 91, 89, 31, -23, -49, -55, -49, -23, 31, 89, 91, 1, 1, -137, -139, -93, -43, 19, 85, 115, 85, 19, -43, -93, -139, -137, 1, 1, 51, 49, 135, 225, 183, 1, -201, -287, -201, 1, 183, 225, 135, 49, 51, 1, 1, 399

Offset: 0

Jonas Wallgren, Apr 13 2007

All edge elements are 1 and the triangle is symmetric about the central line. For all elements x inside the triangle
..a..
.bxc.
we have x=a+b+c. The triangle is symmetric. The top of the triangle thus is
........1
.....1..3..1
..1.-5.-7.-5..1
1..7..5..3..5..7..1

R. J. Mathar, Comments on A129392, A129394 and A129396

Cf. A129393, A129394, A129396, A129398.

More terms from R. J. Mathar, Jan 17 2008

cp's OEIS Frontend

A129399 Level sums of A129398.

Views

Author

Keywords

Examples

Crossrefs

A129392 Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1).

Views

Author

Keywords

Comments

Links

Crossrefs

Extensions