Number of pairs with two different elements which can be obtained by selecting unique elements from two sets with n+1 and n^2 elements respectively and n common elements.
A085490
Number of pairs with two different elements which can be obtained by selecting unique elements from two sets with n+1 and n^2 elements respectively and n common elements.
Terms
- a(0) =0a(1) =1a(2) =10a(3) =33a(4) =76a(5) =145a(6) =246a(7) =385a(8) =568a(9) =801a(10) =1090a(11) =1441a(12) =1860a(13) =2353a(14) =2926a(15) =3585a(16) =4336a(17) =5185a(18) =6138a(19) =7201a(20) =8380a(21) =9681a(22) =11110a(23) =12673a(24) =14376a(25) =16225a(26) =18226a(27) =20385a(28) =22708a(29) =25201
External references
- oeis: A085490