A099172 - OEIS

A099172 as a triangular array

1

1 1

1 2 1

1 2 2 1

1 2 4 2 1

1 2 5 5 2 1

1 2 6 8 6 2 1

1 2 7 11 11 7 2 1

1 2 8 14 18 14 8 2 1

1 2 9 17 26 26 17 9 2 1

1 2 10 20 35 42 35 20 10 2 1

1 2 11 23 45 62 62 45 23 11 2 1

1 2 12 26 56 86 100 86 56 26 12 2 1

1 1 1 1 1 1 1 1 1 1 1 1 1

1 2 2 2 2 2 2 2 2 2 2 2

1 2 4 5 6 7 8 9 10 11 12

1 2 5 8 11 14 17 20 23 26

1 2 6 11 18 26 35 45 56

1 2 7 14 26 42 62 86

1 2 8 17 35 62 100

1 2 9 20 45 86

1 2 10 23 56

1 2 11 26

1 2 12

1 2

1