A024949 a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=a(2)=1 and a(3)=4.

1, 1, 4, 4, 4, 20, 36, 52, 132, 292, 580, 1252, 2628, 6772, 14820, 32404, 75012, 183108, 423428, 953924, 2225028, 5435604, 12770340, 29545076, 69900164, 170528612, 405553988, 954683428, 2267938244, 5585542964, 13382224612, 31793247188

Offset

1,3

Links

Table of n, a(n) for n=1..32.

Crossrefs

Sequence in context: A216871 A120914 A303397 * A362374 A059812 A077725

Adjacent sequences: A024946 A024947 A024948 * A024950 A024951 A024952

Keyword

nonn

Author

Clark Kimberling

Extensions

Offset corrected and title improved by Sean A. Irvine, Jul 30 2019

Status

approved