A061930 Square array read by antidiagonals of T(n,k)=T(n-1,[k/2])+T(n-1,[k/3]) with T(0,0)=1.

1, 0, 2, 0, 2, 4, 0, 1, 4, 8, 0, 0, 4, 8, 16, 0, 0, 4, 8, 16, 32, 0, 0, 3, 8, 16, 32, 64, 0, 0, 3, 8, 16, 32, 64, 128, 0, 0, 1, 8, 16, 32, 64, 128, 256, 0, 0, 1, 8, 16, 32, 64, 128, 256, 512, 0, 0, 1, 8, 16, 32, 64, 128, 256, 512, 1024, 0, 0, 0, 7, 16, 32, 64, 128, 256, 512, 1024

Offset

0,3

Links

Table of n, a(n) for n=0..76.

Example

T(9, 7) = T(8, [7/2])+T(8, [7/3]) = T(8, 3)+T(8, 2) = 256+256 = 512. Rows start (1, 0, 0, 0, 0, ...), (2, 2, 1, 0, 0, ...), (4, 4, 4, 4, 3, ...) etc.

Crossrefs

Row sums are 5^n, i.e. A000351. Each row starts with 2^n copies of 2^n, i.e. A000079 and then continues with A036561 copies of other terms in the rows of A055248. Cf. A061929.

Sequence in context: A261685 A136716 A117946 * A209691 A221683 A332760

Adjacent sequences: A061927 A061928 A061929 * A061931 A061932 A061933

Keyword

nonn,tabl

Author

Henry Bottomley, May 22 2001

Status

approved