A143593 Triangle read by rows, square of A238303 (an infinite lower triangular matrix with 1's in the first column and the rest 2's).

1, 3, 4, 5, 8, 4, 7, 12, 8, 4, 9, 16, 12, 8, 4, 11, 20, 16, 12, 8, 4, 13, 24, 20, 16, 12, 8, 4, 15, 28, 24, 20, 16, 12, 8, 4, 17, 32, 28, 24, 20, 16, 12, 8, 4, 19, 36, 32, 28, 24, 20, 16, 12, 8, 4

Offset

1,2

Comments

Row sums = A056220 starting with offset 1: (1, 7, 17, 31, 49, 71, 97,...).

Links

Table of n, a(n) for n=1..55.

Formula

Triangle read by rows, square of an infinite lower triangular matrix with 1's in the first column and the rest 2's. Square of (A000012 * (S(k) * 0^(n-k)), 1<=k<=n

Example

The square of the infinite lower triangular matrix (1; 1,2; 1,2,2;...) =
1;
3, 4;
5, 8, 4;
7, 12, 8, 4;
9, 16, 12, 8, 4;
11, 20, 16, 12, 8, 4;
13, 24, 20, 16, 12, 8, 4;
...

Crossrefs

Cf. A056220, A238303.

Sequence in context: A325410 A269719 A214626 * A379133 A364089 A028267

Adjacent sequences: A143590 A143591 A143592 * A143594 A143595 A143596

Keyword

nonn,tabl

Author

Gary W. Adamson & Roger L. Bagula, Aug 26 2008

Status

approved