n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 26 |
3 | 132 |
4 | 623 |
5 | 2632 |
6 | 10500 |
7 | 39384 |
8 | 141659 |
9 | 490100 |
10 | 1644186 |
11 | 5366436 |
12 | 17113433 |
13 | 53454528 |
14 | 163963312 |
15 | 494786352 |
16 | 1471423866 |
17 | 4318092136 |
18 | 12520027756 |
19 | 35901819336 |
20 | 101909674398 |
21 | 286575107424 |
22 | 798886300056 |
23 | 2209115439664 |
24 | 6062818714752 |
25 | 16522049256656 |
[1,4,26,132,623,2632,10500,39384,141659,490100, 1644186,5366436,17113433,53454528,163963312, 494786352,1471423866,4318092136,12520027756, 35901819336,101909674398,286575107424, 798886300056,2209115439664,6062818714752, 16522049256656] |