Number of quadrilaterals in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).
A332607
Number of quadrilaterals in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).
Terms
- a(0) =2a(1) =8a(2) =36a(3) =92a(4) =194a(5) =336a(6) =554a(7) =812a(8) =1314a(9) =1756a(10) =2508a(11) =3252a(12) =4348a(13) =5464a(14) =7054a(15) =8760a(16) =11050a(17) =13324a(18) =16162a(19) =19256a(20) =23188a(21) =27120a(22) =32098a(23) =37396a(24) =43456a(25) =49516a(26) =57608a(27) =65440a(28) =74670a(29) =84388
External references
- oeis: A332607