A296978 - OEIS

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A296978

List of normal sequences ordered first by length and then lexicographically, where a finite sequence is normal if it spans an initial interval of positive integers.

1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 2, 3, 1, 3, 2, 2, 1, 1, 2, 1, 2, 2, 1, 3, 2, 2, 1, 2, 3, 1, 3, 1, 2, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 2, 3, 1, 1, 3, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 2, 1, 1

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OFFSET

1,5

LINKS

Table of n, a(n) for n=1..87.

FORMULA

Row n is formed by A000670(n) sequences and has total length n * A000670(n).

EXAMPLE

Triangle of normal sequences begins:

11,12,21,

111,112,121,122,123,132,211,212,213,221,231,312,321.

MATHEMATICA