A127497 Main diagonal of triangle A127496: a(n) = A127496(n,n) for n>=0.

1, 1, 2, 7, 23, 83, 306, 1135, 4257, 16095, 61222, 233956, 897499, 3454211, 13331358, 51575877, 199954871, 776642435, 3021505570, 11772342667, 45927761857, 179393034333, 701465614758, 2745595628417, 10756232646630, 42174080381586

Offset: 0

Author

Paul D. Hanna, Jan 16 2007

Keywords

• nonn

Links

• Paul D. Hanna, Table of n, a(n) for n = 0..1040

Crossrefs

Cf. A127496, A127498.

Formula

a(n) ~ c * 4^n / sqrt(n), where c = 0.1893687633123847717351285248043394631769854231497885277419320199497639583... - Vaclav Kotesovec, Jun 15 2018