A055877 Least increasing sequence with a(1) = 1 and Hankel transform {1,1,1,1,...}.

1, 2, 5, 6, 42, 43, 18626, 18627, 5798368522871, 5798368522872, 194935493755610196550803104551677768964, 194935493755610196550803104551677768965

Offset

1,2

Comments

Hankel transform {t(n)} of {a(n)} is given by t(n) = Det[{a(1), a(2), ..., a(n)}, {a(2), a(3), ..., a(n+1)}, ..., {a(n), a(n+1), ..., a(2n-1)}].

Links

Table of n, a(n) for n=1..12.

Example

Given that {a(n)} = {1,2,5,6,a(5),...}, a(5) is seen to be 42 since Det[{1,2,5},{2,5,6},{5,6,42}] = 1, whereas Det[{1,2,5},{2,5,6},{5,6,43}] = 2.

Crossrefs

Sequence in context: A152918 A276845 A365503 * A288799 A281378 A219117

Adjacent sequences: A055874 A055875 A055876 * A055878 A055879 A055880

Keyword

nonn

Author

John W. Layman, Jul 14 2000

Status

approved