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a(n) = floor((Pi^2/6)^n).
1

%I #6 Jul 22 2022 11:42:39

%S 1,1,2,4,7,12,19,32,53,88,145,238,392,645,1061,1746,2873,4726,7774,

%T 12788,21036,34603,56920,93630,154015,253345,416735,685503,1127607,

%U 1854839,3051088,5018839,8255660,13580017,22338233,36744921,60442973,99424705,163547085

%N a(n) = floor((Pi^2/6)^n).

%t Table[Floor[(Pi^2/6)^n], {n, 1, 100}]

%Y Cf. A125890-A125899.

%K nonn

%O 0,3

%A _Artur Jasinski_, Dec 13 2006

%E a(0)=1 prepended by _Alois P. Heinz_, Jul 22 2022