A128444 Array T by antidiagonals: T(n,k)=Floor(k*3^(n/2)).

1, 3, 3, 5, 6, 5, 6, 9, 10, 9, 8, 12, 15, 18, 15, 10, 15, 20, 27, 31, 27, 12, 18, 25, 36, 46, 54, 46, 13, 21, 31, 45, 62, 81, 93, 81, 15, 24, 36, 54, 77, 108, 140, 162, 140, 17, 27, 41, 63, 93, 135, 187, 243, 280, 243, 19, 30, 46, 72, 109, 162, 233, 324, 420, 486, 420, 20, 33

Offset

1,2

Comments

Row 1 = A022838; Row 2 = A008585; Column 1 = A017913; T(n,n) = A128443(n).

Links

Table of n, a(n) for n=1..68.

Example

Northwest corner:
1 3 5 6 8
3 6 9 12 15
5 10 15 20 25
9 18 27 36 45

Crossrefs

Cf. A128443.

Sequence in context: A243305 A334075 A140351 * A317745 A204250 A131948

Adjacent sequences: A128441 A128442 A128443 * A128445 A128446 A128447

Keyword

nonn,tabl

Author

Clark Kimberling, Mar 03 2007

Status

approved