n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 16 |
4 | 74 |
5 | 360 |
6 | 1840 |
7 | 9698 |
8 | 52409 |
9 | 288697 |
10 | 1615275 |
11 | 9153850 |
12 | 52434770 |
13 | 303104532 |
14 | 1765920785 |
15 | 10358843904 |
16 | 61129390652 |
17 | 362650003202 |
18 | 2161590275029 |
19 | 12938838382316 |
20 | 77745063802045 |
21 | 468760264760369 |
22 | 2835272729215565 |
23 | 17198394229862818 |
24 | 104598950726341920 |
25 | 637709136315071504 |
[1,1,4,16,74,360,1840,9698,52409,288697,1615275, 9153850,52434770,303104532,1765920785,10358843904, 61129390652,362650003202,2161590275029, 12938838382316,77745063802045,468760264760369, 2835272729215565,17198394229862818, 104598950726341920,637709136315071504] |