317030

Appears in sequences

• 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=23A075111
• Sum of odd-indexed terms of tribonacci numbers.at n=11A113301
• Diagonal sums of Riordan array A154948.at n=21A154949