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A143593 Triangle read by rows, square of an infinite lower triangular matrix with 1's in the first column and the rest 2's. 1
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 (list; table; graph; refs; listen; history; text; internal format)
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.

Sequence in context: A325410 A269719 A214626 * A028267 A215497 A092997

Adjacent sequences:  A143590 A143591 A143592 * A143594 A143595 A143596

KEYWORD

nonn,tabl

AUTHOR

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

STATUS

approved

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Last modified July 5 19:02 EDT 2020. Contains 335473 sequences. (Running on oeis4.)