A061892 Lionel-Levine-sequence generated by (1,0,0).

0, 3, 1, 3, 3, 6, 10, 28, 108, 1011, 32511, 9314238, 84560776390, 219625370880235960

Offset: 0

Author

Frank Ellermann, May 13 2001

Keywords

• nonn
• more

Comments

A011784 allows the addition of a(-1)=0 and a(0)=2 using row A012257(-2)=1 and A012257(-1)=0 resp. row A012257(0)=2. In this sense A011784 / A012257 are "generated" by (1,0), A061892 / A061893 by (1,0,0), A061894 / A061895 by (2,0).

Examples

			a(4) = 3: (1,0,0), (3), (1,1,1), (1,2,3), (1,1,1,2,2,3).
		

Crossrefs

Cf. A011784, A012257, A061893, A061894.

Programs

Rexx

/* replace 1 0 0 with 1 0 to get A011784 */
S = ''; A = 1 0 0; do N = 1 to 10; T = words( A );
S = S word( A, T ); B = A; A = ''; do K = 1 to T;
A = A space( copies( K '', word( B, T + 1 - K )));
end K; end N; T = words( A ); say S word( A, T ) T;

Extensions

a(11) from Naohiro Nomoto, May 10 2002

a(12) from Michael Anthony Keyes, Apr 14 2021

a(13) from Michael Anthony Keyes, May 13 2021