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Template:Seal pyramid/Liana/valency/sum

From Wikiversity
d
a
0 1 2 3 4 5 6 7 Σ
0 1 1
1 1 1 2
2 1 3 1 5
3 1 7 7 1 16
4 1 15 35 15 1 67
5 1 31 155 155 31 1 374
6 1 63 651 1395 651 63 1 2825
7 1 127 2667 11811 11811 2667 127 1 29212