A167142 Column 0 of the matrix square of triangle A167015.

1, 2, 5, 23, 171, 1770, 23128, 359326, 6397582, 127481106, 2798191975, 66906139414, 1728471631521, 47946527974230, 1421014299626478, 44813786218342428, 1498598183095006145, 52978138615818746064

Offset

0,2

Comments

This sequence equals the reversal of row 2 of A167015 (when infinitely extended to the left), and then shifted left 1 place.

In triangle T=A167015, row n of T equals the initial n terms in column 0 of matrix power T^n, reversed and with an appended '1'.

The definition of A167015 may be relaxed to allow the triangle to extend indefinitely also to the left, making each row infinite.

Links

Table of n, a(n) for n=0..17.

Crossrefs

Cf. A167015, rows: A167016, A167143, A167144, A167145.

Sequence in context: A165902 A191600 A343020 * A136731 A257030 A062495

Adjacent sequences: A167139 A167140 A167141 * A167143 A167144 A167145

Keyword

nonn

Author

Paul D. Hanna, Oct 28 2009

Status

approved