A349974 a(n) = 1 + Sum_{k=0..n} (2*k - 1)*A349976(n, k).
0, 1, 5, 17, 53, 147, 389, 981, 2401, 5697, 13293, 30423, 68745, 153403, 339195, 743169, 1617857, 3497875, 7523697, 16102889, 34324847, 72875031, 154233691, 325388121, 684664081, 1436991619, 3009410483, 6289146455, 13119434889, 27319198507, 56799400255, 117916622547
Offset: 0