[0,0,0,0,1,6,23,77,240,705,1988,5468,14724,39006,
101818,261924,663748,1655781,4062110,9793065,
23186825,53896597,122975627,275449464,605794093,
1308633243,2777847319,5797093774,11900199553,
24042491094,47833081481,93765335118,181200186060,
345389067067,649704599010]
|