A047137 a(n) = T(n,n+2), array T as in A047130.

1, 3, 9, 28, 104, 367, 1295, 4600, 17229, 64069, 238148, 886823, 3366045, 12793452, 48663267, 185303586, 711046282, 2734845898, 10532016662, 40599379289, 157049408777, 608667818351, 2361851906708, 9173261457282

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A047130.

Extensions

Definition corrected by Georg Fischer, Jan 20 2020