a(n) is the number of tetrapods standing on the four edges of an n X n grid, so that no two feet are the same distance apart and no foot is on a corner. Tetrapods with congruent footprints are counted only once.
A353447
a(n) is the number of tetrapods standing on the four edges of an n X n grid, so that no two feet are the same distance apart and no foot is on a corner. Tetrapods with congruent footprints are counted only once.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =11a(4) =40a(5) =105a(6) =190a(7) =379a(8) =616a(9) =987a(10) =1426a(11) =2139a(12) =2964a(13) =4130a(14) =5403a(15) =7180a(16) =9155a(17) =11716a(18) =14458a(19) =18092a(20) =22037a(21) =26808a(22) =31793a(23) =38343a(24) =45060a(25) =53184a(26) =61613a(27) =71878a(28) =82466a(29) =95368
External references
- oeis: A353447