1,2

Observe that all terms (except 1) are number-pairs starting with even number (e.g. 88,89).

Table of n, a(n) for n=1..54.

For n=10 and 11, 10! or 11! are divided both by 5!^2 and 6!^2.

Cf. A056038-A056044, A056068.

Sequence in context: A300376 A136828 A136833 * A300678 A086458 A179856

Adjacent sequences: A056064 A056065 A056066 * A056068 A056069 A056070

nonn

Labos Elemer, Jul 26 2000

approved