A011847 - OEIS

A011847 as a triangular array

1

1 1

1 1 1

1 2 2 1

1 2 3 2 1

1 3 5 5 3 1

1 3 7 8 7 3 1

1 4 9 14 14 9 4 1

1 4 12 21 25 21 12 4 1

1 5 15 30 42 42 30 15 5 1

1 5 18 41 66 77 66 41 18 5 1

1 6 22 55 99 132 132 99 55 22 6 1

1 6 26 71

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

1 1 2 2 3 3 4 4 5 5 6 6

1 2 3 5 7 9 12 15 18 22 26

1 2 5 8 14 21 30 41 55 71

1 3 7 14 25 42 66 99

1 3 9 21 42 77 132

1 4 12 30 66 132

1 4 15 41 99

1 5 18 55

1 5 22

1 6

1