The sum of the numbers on the perimeter of the n X n diamond frame, located at the top of the numerical pyramid containing the positive integers in natural order.
A359096
The sum of the numbers on the perimeter of the n X n diamond frame, located at the top of the numerical pyramid containing the positive integers in natural order.
Terms
- a(0) =1a(1) =11a(2) =46a(3) =121a(4) =252a(5) =455a(6) =746a(7) =1141a(8) =1656a(9) =2307a(10) =3110a(11) =4081a(12) =5236a(13) =6591a(14) =8162a(15) =9965a(16) =12016a(17) =14331a(18) =16926a(19) =19817a(20) =23020a(21) =26551a(22) =30426a(23) =34661a(24) =39272a(25) =44275a(26) =49686a(27) =55521a(28) =61796a(29) =68527
External references
- oeis: A359096