Let M = the 4 X 4 matrix [0 1 0 0 / 0 0 1 0 / 0 0 0 1 / -1 -1 3 2]. Set seed vector = [1 1 1 1] = first row, then take M*[1 1 1 1] = [1 1 1 3] then M * [1 1 1 3], etc. Sequence gives terms in rightmost column.

A091650

Let M = the 4 X 4 matrix [0 1 0 0 / 0 0 1 0 / 0 0 0 1 / -1 -1 3 2]. Set seed vector = [1 1 1 1] = first row, then take M*[1 1 1 1] = [1 1 1 3] then M * [1 1 1 3], etc. Sequence gives terms in rightmost column.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =21a(4) =59a(5) =171a(6) =491a(7) =1415a(8) =4073a(9) =11729a(10) =33771a(11) =97241a(12) =279993a(13) =806209a(14) =2321385a(15) =6684163a(16) =19246279a(17) =55417453a(18) =159568195a(19) =459458307a(20) =1322957467a(21) =3809304207a(22) =10968454313a(23) =31582405473a(24) =90937912211a(25) =261845282321a(26) =753953441489

External references