A367324 Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of edges in the resulting planar graph.
3, 21, 8, 132, 92, 20, 429, 596, 290, 42, 1272, 1936, 2215, 708, 91, 2826, 6020, 7405, 4020, 1575, 136, 5640, 11088, 21150, 15120, 10962, 2632, 288, 10461, 26260, 43490, 38544, 35812, 17728, 5148, 390, 17094, 42144, 88230, 83136, 96257, 60672, 33291, 7800, 715
Offset: 3
Examples
The table begins: 3, 21, 132, 429, 1272, 2826, 5640, 10461, 17094, 26847, 41046, 61041, 84051, ... 8, 92, 596, 1936, 6020, 11088, 26260, 42144, 72296, 107832, 183340, 222940, ... 20, 290, 2215, 7405, 21150, 43490, 88230, 151135, 250825, 384360, 578840, ... 42, 708, 4020, 15120, 38544, 83136, 169686, 294678, 475500, 746340, 1140624, ... 91, 1575, 10962, 35812, 96257, 201054, 389991, 668458, 1096508, 1675835, ... 136, 2632, 17728, 60672, 163776, 341920, 673112, 1155144, 1892528, 2905088, ... 288, 5148, 33291, 108252, 283464, 591723, 1133928, 1941786, 3166605, 4837824, ... 390, 7800, 48870, 164470, 430840, 900890, 1735800, 2982660, 4849740, 7438490, ... 715, 12793, 79134, 255552, 660033, 1376870, 2619287, 4482654, 7284904, ... 756, 16512, 99348, 346140, 912960, 1894920, 3685056, 6313164, 10261200, ... 1508, 26806, 160641, 516932, 1322802, 2757339, 5221996, 8932664, 14483183, ... 1722, 35546, 210658, 696682, 1773828, 3718400, 7030464, 12067720, 19517596, ... 2835, 49995, 292590, 939720, 2388825, 4976130, 9394815, 16064970, 26003640, ... 3088, 63456, 370784, 1217664, 3081472, 6455872, 12162640, 20861328, 33700320, ... 4896, 85680, 493017, 1579436, 3995102, 8318525, 15667336, 26783636, ... 4320, 99036, 593784, 1958922, 4978872, 10395450, 19644408, ... 7923, 137693, 781470, 2499792, 6298633, 13109658, 24645983, ... 8360, 167160, 941940, 3068280, 7705420, 16112480, 30238400, ... 12180, 210378, 1180683, 3772692, 9476418, 19717089, ... 12782, 252296, 1400674, 4547884, 11375584, 23776236, ... 17963, 308591, 1716306, 5478232, 13725457, 28550084, ... 16344, 350448, 1981416, 6460080, 16185624, ... 25600, 437700, 2415825, 7704700, 19262750, ... . . .
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