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A124458

Triangular array resulting from summing three repeated Pascal sequences; related to the generalized pentagonal sequence (A001318) and the classical modular tessellation (cf. A054886).

1, 2, 1, 3, 2, 1, 3, 4, 2, 1, 3, 5, 5, 2, 1, 3, 7, 7, 6, 2, 1, 3, 8, 12, 9, 7, 2, 1, 3, 10, 15, 18, 11, 8, 2, 1, 3, 11, 22, 24, 25, 13, 9, 2, 1, 3, 13, 26, 40, 35, 33, 15, 10, 2, 1

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OFFSET

1,2

COMMENTS

The third diagonal is the generalized pentagonal sequence A001318

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

Consider

1.......1.......6.......6.......21......21....

........1.......1.......6.......6.......21....

................1.......1.......6.......6.....