172366

Appears in sequences

• a(n) = Sum_{i=0..floor(n/2)} A047080(n,i).at n=21A047082
• a(n) = Sum_{i=0..floor(n/2)} (-1)^(i+floor(n/2))*T(2i+e), where T(n) are tribonacci numbers (A000073) and e = (1/2)(1-(-1)^n).at n=22A075111
• Sum of even-indexed terms of tribonacci numbers.at n=11A113300
• Diagonal sums of Riordan array A154948.at n=20A154949
• Collatz (or 3x+1) trajectory starting at 10087.at n=14A161022