OFFSET

1,1

COMMENTS

This is the array remaining after row 1 is expelled from the array in A163253.

LINKS

Clark Kimberling, Doubly interspersed sequences, double interspersions and fractal sequences, The Fibonacci Quarterly 48 (2010) 13-20.

FORMULA

Let S(n,k) for the k-th term in the n-th row.

if n is odd, then S(n,k)=k^2+(n-1)k+(n^2+3)/4;

if n is even, then S(n,k)=k^2+(n-1)k+(n^2)/4.

EXAMPLE

Corner:

2....5...10...17...26

3....7...13...21...31

6...11...18...27...38

CROSSREFS

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling, Jul 23 2009

STATUS

approved