节点子集包含在矩形的左上角四分之一中,并具有节点尺寸floor((n+1)/2)和2,以捕获所有几何上不同的计数。四分之一直角由行读取。不规则数字数组为:
……k…..1…..2…..3…..4…..5…..6…..7…..8…..9….10
…n个
..2......10.....0
..3......33.....6.....4.....0
..4......90....22....22.....4
..5.....256....52....67....14....88....32
..6.....720...104...187....30...236...108
..7....1931...200...495....56...622...262...602...364
..8....5029...386..1245...106..1624...618..1537...898
..9...12996...744..3061...206..4080..1502..3938..2186..3744..2196
.10...33512..1422..7615...398.10014..3676..9775..5466..9177..5246
其中k表示末端节点在四分之一直角中的位置。对于每个n,k的最大值为2*floor((n+1)/2)。按行读取此数组将给出序列。