三角形T(n,k)
n \k 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 0;
2 1, 0;
3 1, 0, 0;
4 2, 1, 0, 0;
5 4, 1, 0, 0, 0;
6 9, 3, 1, 0, 0, 0;
7 20, 6, 1, 0, 0, 0, 0;
8 48, 16, 3, 1, 0, 0, 0, 0;
9 115, 37, 7, 1, 0, 0, 0, 0, 0;
10 286, 96, 18, 3, 1, 0, 0, 0, 0, 0;
11 719, 239, 44, 7, 1, 0, 0, 0, 0, 0, 0;
12 1842, 622, 117, 19, 3, 1, 0, 0, 0, 0, 0, 0;
13 4766, 1607, 299, 46, 7, 1, 0, 0, 0, 0, 0, 0, 0;
14 12486, 4235, 793, 124, 19, 3, 1, 0, 0, 0, 0, 0, 0, 0;
15 32973, 11185, 2095, 320, 47, 7, 1, 0, 0, 0, 0, 0, 0, 0, 0;
...
n \k 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A005199号(6) =和{k=1..6}(k*T(6,k))=1*9+2*3+3*18。