n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 6 |
3 | 18 |
4 | 45 |
5 | 120 |
6 | 312 |
7 | 819 |
8 | 2142 |
9 | 5610 |
10 | 14685 |
11 | 38448 |
12 | 100656 |
13 | 263523 |
14 | 689910 |
15 | 1806210 |
16 | 4728717 |
17 | 12379944 |
18 | 32411112 |
19 | 84853395 |
20 | 222149070 |
21 | 581593818 |
22 | 1522632381 |
23 | 3986303328 |
24 | 10436277600 |
25 | 27322529475 |
26 | 71531310822 |
27 | 187271402994 |
28 | 490282898157 |
29 | 1283577291480 |
[0,3,6,18,45,120,312,819,2142,5610,14685,38448, 100656,263523,689910,1806210,4728717,12379944, 32411112,84853395,222149070,581593818,1522632381, 3986303328,10436277600,27322529475,71531310822, 187271402994,490282898157,1283577291480] |